Panasonic Air Conditioner: Complete Troubleshooting Guide


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Panasonic air conditioners are terrific appliances. However, even the best air conditioner will give you trouble at some point, and Panasonic ACs are no exception.

That’s when I’ve put together this complete Panasonic air conditioner troubleshooting guide. In this guide, you’ll find explanations and solutions for every single problem your Panasonic AC might present.  I’ll also mention when it’s best to skip the trouble and call an HVAC repair service instead of trying to fix the issue yourself.

Let’s get to it. This is a large guide, so I recommend that you use this table of contents to quickly jump to the issue your AC is experiencing:

Potential Problems hide

Panasonic Air Conditioner Not Turning On/Not Working

If your Panasonic air conditioner is not turning on/not working, there’s no power supply to the AC, the power circuit breaker has tripped, or the control board is faulty. A tripped circuit breaker is common if power surges are frequent in your line. A trained electrician should resolve power issues.

Power Supply Issues

Power supply issues can be caused by an unplugged AC cable, a dead wall outlet, a dead power cable, or a utility power outage.

How to Diagnose Power Issues in your Panasonic AC

Depending on the issue, perform the following:

  1. Check to ensure your AC’s power cable is plugged in and the socket switch turned on.
  2. Plug a different home appliance to a wall outlet that appears to be dead and not supplying power to see if the issue is with your AC or the wall outlet.
  3. Try plugging your AC’s power cable into different wall outlets to see if it works with any of them.
  4. Try out other power-dependent appliances or switch on a bulb to check if there’s a power outage.

How to Fix Power Issues with Your Panasonic AC

To fix Panasonic AC power issues:

  1. Plug an unplugged AC power cable. This should be the first thing you do before proceeding to assess your AC for other power issues. 
  2. Call a trained electrician to repair a dead wall outlet.
  3. Report or enquire about utility power outages in your area so the power supply can be restored. 

A Tripped Circuit Breaker 

A circuit breaker is an electrical control point that regulates the power supply to your home and to electrical appliances so that they do not suffer a current overload or the resultant damage.

To do so, the circuit breaker automatically cuts the power supply (trips) when there’s a power surge.

How to Diagnose a Tripped Circuit Breaker

In normal operation, a circuit breaker has the switches pushed up (the ‘on’ position). If the circuit breaker trips due to a power surge or a short circuit, the switches will be down (the ‘off’’ position). 

If the entire power line for your home is threatened by a power surge or short circuit, the main switch will be off. If only the power line to your AC is threatened, the switch for your AC line will be off.

How to Fix a Tripped Circuit Breaker 

Simply open the circuit breaker panel and push the tripped power switch up slowly. If the power switch feels hard to push up, do not force it as this could be a sign of a bigger problem. Call a trained electrician instead.

Faulty AC Power Control Board

A control board is the central power supply system to all the parts of your AC. If the power control board is faulty so that power is not sent to your AC, a main part of your AC such as the compressor and fan will not start to run.

How to Diagnose a Faulty Panasonic AC Control Board

Use a multimeter to test Panasonic AC power supply wires for continuity. If no continuity is recorded, the control board is most likely faulty. 

If you hire a pro, the expert HVAC or electrician will use a multimeter to tell if there are issues with the control board or specific power supply wires.

How to Fix a Faulty Panasonic AC Control Board

AC power issues are always best addressed by a trained HVAC or electrician. Call in a reliable electrician or HVAC pro to assess your Panasonic AC control board for faults and proceed to make the necessary repairs/replacement. 

Your Panasonic AC power control board may just need a single wire repair as in the case of Tobz173 on Whirlpool Forums whose Panasonic AC would not start because a mouse had chewed a cable and says: 

“Just an update, had a techy come out yesterday for a look, all was not looking good with the system completely dead after 45 minutes of fault finding. Until he looked at the inside unit’s PCB board where he found a mouse had chewed perfectly through one wire.”

Alternatively, if the expert HVAC determines that your AC’s power control board is indeed faulty, a replacement will be done. Note that we can send you an expert HVAC pro to attend to your Panasonic power issues as soon as you fill and submit the form at the bottom of this article.

Panasonic Air Conditioner Remote Not Working/Not Responding to Remote 

If your Panasonic air conditioner remote control is not working, the remote control is too far from the AC, the remote control is defective, the AC thermostat sensor is dead, or the main control board is faulty. Dead remote control batteries are the most common cause, resolved by replacing them. 

Remote Control is too Far from AC

Your Panasonic AC remote control sensor has a limit remote sensor distance from the AC’s thermostat sensor (around 20 feet/8meters).

If you are sending commands from the remote control to the AC from a distance longer than this, the command may not be delivered to the thermostat sensor and your Panasonic AC will not respond to the remote control command.

Objects that stand between your remote control and the AC can also block the way of the sensors.

How to Diagnose and Fix Long Remote Control Distance from AC

Move closer to the AC with the remote control and try giving commands at close proximity. If that does not resolve the issue, the remote control or the AC thermostat sensor could be defective.

Defective Remote Control

A defective remote control could be having dead batteries or have a defective sensor, which means the communication between the remote control and the AC thermostat sensor is not completed.

How to Diagnose a Defective Panasonic AC Remote Control

There are 3 things you should check to see if your Panasonic AC remote control is defective:

  • First, test the remote control batteries to see if they are charged. To be charged, the batteries should show a voltage higher than 1.3, otherwise, they are dead.
  • Also, ensure that your remote control battery poles are placed to the corresponding charges (-ve with –ve and +ve with +ve).
  • Check if the remote control LED sensor light goes on when you press a command. If it doesn’t, it could be either dead batteries or the sensor wire inside the remote is broken and detached from other internal parts.

How to Fix a Defective Panasonic AC Remote Control

Depending on the problem affecting your Panasonic AC remote control:

  • Replace dead remote control batteries with new charged ones:
    1. Pull the back cover of the remote control following the arrow indication.
    2. Remove the dead batteries and insert the AAA or R03 batteries.
    3. Replace the cover and test the remote control.
  • Correct wrongly placed AC remote control batteries by placing the –ve battery pole with the –ve remote port and the +ve battery pole with the +ve remote port.
  • If the sensor does not light and the batteries are not the issue, you could have it checked and repaired by an electrician, but, buying a new remote control is cheaper than having it repaired.

Dead AC thermostat Sensor

Just like the remote control, the AC thermostat has a sensor that communicates with the remote to execute commands. 

So, if your Panasonic AC remote control does not show any defects but it’s not working, the thermostat sensor could be defective, which explains why your Panasonic AC is not responding to the remote control. 

How to Diagnose and Fix a Dead AC Thermostat Sensor

Look for the thermostat sensor near the evaporator coils. You can consult your AC’s User Manual for help.

If the thermostat sensor is bent out of its usual place, place it back and see if it resumes function. If not, you may need to call an HVAC expert to test it for continuity or other faults.

A thermostat sensor with a broken wire will have to be replaced. 

Faulty Main Control Board

The main AC control board has an infrared receiver that takes signals from the remote. If this is faulty, the signals from the remote control are not going to be received and the remote control will not communicate with the AC.

How to Diagnose and Fix a Faulty AC Control Board

Call a professional HVAC expert to test the wires responsible for the remote control signals to the control board for continuity. If it is determined that the control board is faulty, the HVAC expert will repair or replace the control board as the case requires.

Note: Some types of fluorescent lights can interfere with our Panasonic remote control signal transmitter. Consult an authorized dealer for more info if you suspect that this could be the case. 

Panasonic Air Conditioner Not Turning Off

If your Panasonic air conditioner is not turning off, the condenser coil may be dirty, the thermostat is giving wrong temperature readings, or the control board is bad and sends voltage nonstop to the compressor and fan. A dirty condenser coil is most common and should be regularly cleaned.

Dirty Condenser Coil 

The function of the condenser coil in an AC is to dissipate heat from the refrigerant so that the air sent to your home can be cooled. 

If the coil is dirty, your Panasonic AC will retain the heat from the cooling process, which reduces the efficiency of your AC and causes it to work extra hard to meet the cool air requirements for your space. In other words, your AC will go for longer-than-usual cycles or not cycle at all and not turn off.

How to Diagnose a Dirty Panasonic AC Condenser Coil

Open the upper panel of your outdoor unit and look inside to notice any leaves, debris, or dust accumulated on the fins of the condenser coil. If that is the case, proceed to clean the condenser coils.

How to Clean Dirty Panasonic AC Condenser Coil

You have two options if your Panasonic AC condenser coil is dirty: 1) Call an expert to do professional cleaning on your outdoor unit especially if you’ve missed the annual routine maintenance or, 2) perform a DIY cleaning on the condenser coils.

Whichever your choice, these steps should be followed to clean your Panasonic condenser coils:

  1. Turn off the power of your cooling unit at the circuit breaker to ensure no voltage runs in any of the parts. Wait 30 minutes for your AC to cool completely.
  2. Remove the upper casing, the air inlet grill on the side, and the front grill in that order. This will reveal the condenser coils and other parts of the outdoor unit such as the fan and electrical parts.
  3. Remove the larger type of dirty such as leaves with your hand then use a soft brush vacuum attachment to remove any debris and loose dirt from the condenser fins. Do not use any hard brushes to avoid bending the coil fins.
  4. Spray water on the coils using a low-pressure hose to remove any remaining dirt and dust. Ensure you do not send any water to the electrical parts. Instead, you can wash the fan while you clean the coil.
  5. Allow the unit to dry completely before replacing the cover panels. 
  6. Once the unit is completely dry, replace the front panel, air input grill, and top panel. 
  7. Switch the AC back on and resume operation and monitor the cooling process to see if it begins to cycle normally.

A Faulty Thermostat

Your Panasonic AC thermostat regulates the cooling cycles by sending signals to the compressor and fan to start running when the set temperature is surpassed and to stop when the set temperature is obtained.

If your AC thermostat is faulty due to a short circuit or wrong positioning in the room, it will not read the room temperature correctly and will consistently detect higher temperature levels than the actual ones. That means your AC will keep running nonstop.

How to Diagnose a Faulty Panasonic AC Thermostat

If you notice that your thermostat is always recording higher temperatures than the actual room temperature or the temperature readings keep fluctuating abnormally, use a multimeter to check the thermostat for continuity. If the multimeter records uninterrupted continuity, then it may have shorted and is sending the ‘run’ signal continuously to the AC.

How to Fix a Faulty Panasonic AC Thermostat

Try turning off your entire cooling system and back on after a few minutes to reset it. If this does not resolve the thermostat issue, call a reliable HVAC expert to assess the thermostat and replace it if it’s faulty. 

We can hasten the process for you by sending an expert Panasonic AC pro as soon as you fill and submit the form at the bottom of this article.

Bad AC Control Board

The control board controls the power supply to parts of your AC. If the control board is faulty due to a power surge or a short circuit, it might continuously send power to the fan and compressor, causing them to run nonstop.

How to Diagnose a Bad Panasonic AC Control Board

Test the wires supplying power to your Panasonic AC parts at the control board for continuity using a multimeter. If no continuity is recorded, the control board is most likely dead and requires replacement.

How to Fix a Bad Panasonic AC Control Board

Contact a reliable HVAC expert to assess and repair/replace a bad Panasonic AC control board. We can be your link to a reliable HVAC pro as soon as you fill and submit the form at the bottom of this article.

Panasonic Air Conditioner Not Cooling/Getting Cold/Blowing Cold Air

If your Panasonic air conditioner is not cooling or blowing cold air, it may have easy-to-troubleshoot issues like wrong thermostat temperature or mode settings and open cold-air outlets or complex causes like a dirty condenser coil or air filter (most common), refrigerant issues, or faulty parts.

Wrong Thermostat Settings/Wrong Mode Selection

Most air conditioners have Auto, Cool, Dry, and Fan modes plus Heat mode for reverse cycle air conditioners. 

During the cooling season, choosing the Cool mode allows you to adjust the temperature level according to how cool you want your space to be. Choosing the Auto mode instead lets your thermostat decide if it should cool or heat depending on the set temperature and the fluctuating room temperature.

How to Diagnose Wrong Panasonic AC Thermostat/Mode Settings

If your AC is not cooling, it might be set on the Dry mode or on an extremely low set temperature that’s never or is rarely obtained, and the AC never resumes the cooling cycle in that case. 

How to Fix Wrong Panasonic AC Thermostat/Mode Settings

Your AC should be set on either the Cool mode (if you want to manually control the set temperature) or Auto (if you want your AC to work on a standard set temperature).

According to Panasonic.ae, the standard setting temperature for the Cooling mode is 25˚C (77˚F) and you can go +2˚C for high or -2˚C for low.

An Undersized Air Conditioner

Your Panasonic air conditioner is made in a size whose cooling/heating energy in BTUs corresponds to a specific size (size range) of heating space in square feet.

If your Panasonic AC is too small in cooling or heating energy for the space you are heating/cooling, your room will never be cooled/heated enough and it might feel like your AC is not working at all.

How to Diagnose an Undersized Panasonic AC

Insufficient cooling is the first sign you will notice if your Panasonic AC is undersized. From a more precise approach, you can tell if your AC is undersized by calculating the size of the heating space (multiply Length by Width) and referring to a reliable AC size guide like the Energy Star Room Air Conditioner Buying Guide to determine if your room/space size corresponds to the size of the AC recommended for that space size. 

 How to Fix an Undersized Panasonic AC

Depending on whether you are planning to purchase your Panasonic AC or are replacing an undersized Panasonic AC, you can do one of the following:

  1. Use the Panasonic Air Conditioning Sizing Wizard to determine the size of the air conditioner you need. You can do this by:
    • Downloading the Panasonic Air Conditioning Sizing Wizard App to your Android or iPhone from Google Play or App Store;
    • Entering some basic info about the space to be heated;
    • Receiving the info about the size of air conditioner that’s best for you; the location of your nearest dealer, a guide map, and access to product features, pricing, and technology details.
  2. Use the earlier mentioned Energy Star Room Air Conditioner Buying Guide to determine the size of the AC you need according to your calculated space size.
  3. Talk to a Panasonic AC expert about your AC size buying options before purchasing/replacing your AC. Fill and submit the form at the bottom of this article and we’ll connect you with a reliable Panasonic AC pro.

Restricted Air Inlet/Outlet

Both the indoor and outdoor units of your Panasonic AC have air inlet and outlet grills. If these are blocked, the air inlet or outlet is restricted and your AC’s efficiency is compromised, which explains why your cooling system will not be cold.

How to Diagnose Restricted Panasonic AC Air Inlet/Outlet

Check if there is any foliage or other objects blocking the airway of your Panasonic outdoor unit. Also, check that any shelter covering your outdoor AC unit is high enough as to not obstruct the dissipation of the heat from the unit or block airflow.

With the indoor unit, check that there’s no furniture, curtains, or indoor plants blocking airflow in and out of your AC.

How to Fix Restricted Panasonic AC Air Inlet/Outlet

Remove any objects obstructing the way of air in and out of your Panasonic AC’s indoor and outdoor units.

Open Cool Air Outlets

Cooled air needs to be retained in the space that’s being cooled to be felt. If you have open doors and windows or broken air ducts, the cooled air is going to be lost to the outside or other unintended spaces.

How to Diagnose Open Cool Air Outlets

Check your ductwork for any signs of leaks. Check to see if any doors or windows are open or have air leaks when the cooling system is on. 

How to Fix Open Cool Air Outlets

Call an HVAC technician to check your ductwork if you suspect that there are any leaks in the system.

Ensure that windows and doors are closed when the cooling process is on. Also, seal any air leaks on doors and windows especially during the cooling season.

Air-Obstructing Room Shape and Orientation

The orientation and shape of your room can make your Panasonic AC feel like it’s not blowing cold air. For example, if your room is facing direct sunlight, it will be warmer than a room that is shielded from direct sun. Also, a rectangular and long room will take longer to have cool air distributed than a square more contained room space.

How to Fix Air-obstructing Room Shape and Orientation

There’s not much you can do to change the orientation or shape of your room/home. So, if the space being cooled has direct sunlight to it, use blinds to keep out the sun rays.

If the space of the room is too spread out that it restricts air distribution, ensure you position your AC at the most central point of the room or install a multi-split AC (one outdoor unit serving more than one indoor unit).

Bad AC Thermostat Positioning

An AC thermostat detects the room temperature to initiate or stop cooling cycles. If your Panasonic AC thermostat is installed in a position where it detects secondary cool air as room temperature, it will not initiate the usual cooling cycles even though the rest of the room is warm. Such positions could be near a cooler or a cool air outlet. 

How to Fix Bad Panasonic AC Thermostat Position

Ensure your Panasonic AC thermostat is not installed in a position where secondary cool air from a cooler or cool-air exit is detected. A central position is more exact in detecting room temperature.

Dirty Air Filters

Most Panasonic air filters are designed with 2 air filters located under the front panel of the indoor unit. These filters are meant to keep away dirt and potentially harmful pathogens from the air sent into your home.

Dirty Panasonic AC air filters cause poor airflow. Limited air into your AC means little cool air is sent to your room from the AC. The limited cool air may not be felt at all and may appear as though your AC is not blowing cold air. Panasonic AC air filter should, therefore, be kept always clean.

How to Diagnose Dirty Panasonic AC Air Filters

To check if the air filters of your Panasonic AC are dirty, ensure the AC is not powered and then lift the front panel to reveal the air filters. Check the filters for dirt and signs of clogging and proceed to clean them if that’s the case. 

How to Clean Dirty Panasonic AC Air Filters

Panasonic advises that you clean your AC air filters every 2 weeks. Follow these steps to clean your Panasonic AC air filters:

  1. Switch off the AC.
  2. Lift the front panel of the indoor unit and then pull it towards you to remove.
  3. Pull the tabs that are near the bottom of the filters’ edges gently and pull the filters towards you to remove them, one at a time.
  4. Wash the filters with water while taking care not to put too much pressure that can damage the filter surface. You can add a little pH-neutral soap or a bit of dishwashing detergent to the water, but avoid harsh detergents or brushes.
  5. Leave the filters to dry under shade and never under direct sunlight or other sources of direct heat.
  6. Reinstall the air filters into the AC unit, ensuring they fit back into the original position.
  7. Switch on the AC and resume operation.

Dirty Condenser Coil

The Panasonic AC condenser coil is situated in the outdoor unit. This exposes it to wind and other sources of dirt and dust.

Since the condenser coil has the function of dispelling the heat from the cooling process, a dirty condenser coil causes the heat to be retained in the cooling system, compromising your AC’s efficiency in cooling the air.

How to Diagnose Dirty Panasonic AC Condenser Coil

To check if the condenser coil is dirty, remove the top cover of the outdoor unit to reveal the coil and check if it’s covered with dirt. If so, proceed to clean the condenser coil.

How to Clean Dirty Panasonic AC Condenser Coil

You can opt to call an HVAC expert to do a thorough condenser coil cleaning or DIY. In either case, cleaning your Panasonic AC condenser coil will follow these steps:

  1. Switch off the AC at the circuit breaker and wait 30 minutes for it to cool completely.
  2. Unscrew and remove the upper panel of the outdoor unit, the side air inlet grill, and the front panel. This will reveal the condenser coil, fan, and electrical parts.
  3. Use a soft brush vacuum cleaner to get rid of the larger dirt particles on the coil and fins. Hard brushes should be avoided at all costs as they can bend the fins and consequently compromise the airflow.
  4. Use a low-pressure hose to spray water on the coils and get rid of any dirt stuck on the coils. Do the same with the fan while you are at it. Be sure not to send any water to the electrical parts.
  5. Leave the outdoor unit open until all the parts are completely dry. 
  6. Replace the covers in reverse order, starting with the front panel, the side air input grill, and finally the top panel. 
  7. Turn on the AC to resume operation and observe to see if normal cooling cycles are resumed and the amount of cool air that’s blown is sufficient.

Refrigerant Issues

If your Panasonic AC has a low refrigerant charge due to a leak or the refrigerant is not being metered correctly, the heat from the cooling process is not going to be dispelled as it should. This means that your AC’s cooling capacity will be limited or completely stalled due to extreme heat, causing your cooling unit not to blow cold air.

How to Diagnose Panasonic AC Refrigerant Issues

Diagnosing low refrigerant levels or abnormal refrigerant metering requires the expertise of an HVAC technician who will use an AC manifold gauge to measure the Freon level and distribution.

How to Fix Panasonic AC Refrigerant Issues

If your Panasonic AC is not cooling and you suspect it has refrigerant issues because all other possible causes have been cleared, fill and submit the form at the bottom of this article and we will send you an expert Panasonic AC expert as a matter of priority. The HVAC pro will: 

  1. Spot and repair the leak on the refrigerant copper coils.
  2. Evacuate the refrigerant from your Panasonic AC.
  3. Recharge the AC with the correct levels of refrigerant/Freon. 
  4. Identify and repair any issues causing poor refrigerant metering.

Faulty AC Parts (PCB/Compressor/Thermistor/Run Capacitor)

Faulty AC parts can cause your AC to run abnormally or fail altogether. These parts could be the power control board, compressor, thermostat, and run capacitor.

A faulty power control board will not send power to other parts of the AC, causing them not to work.

If the compressor is faulty, no cooling will be taking place since it is the heart of the cooling process. 

A faulty run capacitor will not provide the required surge power to start running the AC motor or stabilize the continuous power supply.

A bad thermistor will cause the AC thermostat to send faulty signals to your AC.

All these faults can cause your Panasonic AC not to blow cold air.

How to Diagnose Faulty Panasonic AC Parts

Call a reliable Panasonic AC expert to assess a faulty AC compressor, power control board, run capacitor, and thermistor for continuity or other issues. 

How to Fix Faulty Panasonic AC Parts

An HVAC expert will repair or replace a faulty AC compressor, power control board, run capacitor, and thermistor as the case requires. We can give you a hand by sending a reliable Panasonic AC expert as soon as you fill and submit the form at the bottom of this article.

Panasonic Air Conditioner Not Heating

If your Panasonic AC is not heating, it has wrong AC mode settings, the AC is in the 3-minute self-protection period, or the air conditioner is undersized. A wrong AC mode setting is a more common cause, easily resolved by correcting the settings.

Wrong AC Mode Setting (During Heating)

If you have a reverse-cycle Panasonic air conditioner, your cooling unit needs to be set to the Heat or Auto mode to blow hot air. If it is set on the Cool mode, it will not be heating.

In Heat mode, you can adjust your AC to the desired temperature level. In the Auto mode, the AC initiatives or stops heating cycles according to the standard setting temperature (20˚C/68˚F). The Fan speed needs to be set on High.

How to Diagnose Wrong Panasonic AC Mode Setting (During Heating)

Check your Panasonic AC thermostat to see that it’s set on the Heat or Auto mode and not on the Cool or Dry mode.

How to Fix Wrong Panasonic AC Mode Setting (During Heating)

If your Panasonic AC is set on the Cool or Dry mode, change the setting to Heat mode and adjust the temperature level to the desired heat temperature. If you want your AC to work with the standard setting temperature, set it to Auto mode.

The AC is in Self-protection Period

Panasonic air conditioners operate with a self-protection wait period when both the heating and cooling processes are initiated. This period is usually around 3 minutes. During this time, your AC will not blow hot air in the Heat mode as a self-protection procedure. 

How to Deal with the Panasonic AC Self-protection Period

Simply wait and allow the AC to warm up for the standard 3 minutes. Your AC should start blowing hot air once this period elapses. Do not try to switch your AC on and off in this period or send other commands from the remote control.

Undersized Air Conditioner

As with cooling, your Panasonic air conditioner size should be big enough for the space it’s meant to heat.

As such, if your AC is smaller in heating energy capacity (measured in BTUs) than the recommended size required for the space being heated, it will not supply enough hot air and the space will not feel like it is being heated.

How to Diagnose an Undersized Panasonic AC for Heating Space

To understand if your Panasonic AC is big enough for the room being heated, check the BTU rating of your AC and calculate the size of the room being heated in square feet by multiplying its length and width. 

Proceed to check if the BTU rating is within the required size for the size of your AC. We recommend consulting the Energy Star Room Air Conditioner Buying Guide. The guide will show you the range of space size that would be sufficiently heating by an AC with the number of BTUs your AC is rated for. 

Note that the hot air from your AC may also be rendered insufficient by other factors, even though the AC size is good for the room size: 

  • Rooms with a high ceiling will take up more heat.
  • Rooms that are poorly insulated will take up more heat. Poor insulation has a lot to do with the quality of walls, doors, and windows.
  • Rooms that are of open-floor design will take up more heat than those that are more enclosed.

How to Fix an Undersized Panasonic AC for Heating Space

There are a number of ways you can fix an undersized Panasonic AC for heating space:

  1. Buying the right size of AC from the beginning is the best remedy for an undersized AC. As such, use the Panasonic Air Conditioning Sizing Wizard when buying your Panasonic air conditioner to determine the AC size that’s best suited for your space. To use the sizing wizard:
    1. Download the Panasonic Air Conditioning Sizing Wizard App to your Android or iPhone from Google Play or App Store;
    2. Enter some basic info about the space to be heated;
    3. Receive info about the size of the air conditioner that’s best for you; the location of your nearest dealer, a guide map, and access to product features, pricing, and technology details.
  2. If you’ve already purchased a Panasonic AC that’s smaller for the space you need to heat, pair the AC with another one to make up for the heat deficit from your Panasonic AC.
  3. Replace the small-sized Panasonic AC with a bigger one for the space. This will not only heat your room as desired, but it will also save you the high power bills that come with an overworked AC, which is what happens with an undersized air conditioner.

Panasonic Air Conditioner Dripping/Leaking Water

If your Panasonic AC is dripping or leaking water, the AC may have been installed in a slanting position or the drainpipe fixed in a poor gradient, the condensate drain line may be blocked, or the evaporator coil is frozen. A blocked condensate drain line is more common and should be unclogged.

Bad AC Installation

Defective Panasonic AC installations are linked with water leaks, fires, and electric shocks. Water leaks can be caused by a slanting angle when the AC is installed, causing the drain pan to send water to one side. A poor gradient of the drainage pipe could also cause a leak.

How to Diagnose Bad Panasonic AC Installation

If you have a good eye, you can easily tell when your Panasonic AC is slanting to one side by just looking at it. Alternatively, you can use a tapeline to check if the distance from the floor to either side of the indoor unit is equal. 

How to Fix Bad Panasonic AC Installation

These actions and precautions should be considered to fix bad Panasonic AC installation:

  1. Ensure your Panasonic AC is installed by an authorized dealer right from the word go.
  2. Ensure that the installation instructions on the Service Manual of your Panasonic AC model are followed strictly.
  3. Only use the attached accessories and parts when installing your Panasonic AC.
  4. Call an authorized dealer or an expert HVAC to correct any installation errors that are causing your Panasonic AC to leak. We can hasten the process of contacting a Panasonic AC dealer for you once you fill and submit the form at the bottom of this article.

Blocked AC Drainage Line

Your Panasonic AC will produce condensate during the cooling process. This is the moisture that is removed from the air while it’s being cooled. This moisture is sent down to the drainpipe, through your AC’s drain pipe, and outside through the main drain line.

If there’s a blockage anywhere on the condensate drain path, the moisture will be retained in your AC’s drain pan, and once full, it will start leaking to the wall and down to the floor.

How to Diagnose a Blocked Condensate Drain Line

To check if your Panasonic AC drain line is blocked:

  • Check to see if there’s plenty of standing water in the drain pan. Under normal humidity levels (30-50%), this should not be the case.
  • Check to see if the outdoor outlet of the drain line is sending any moisture out. If not, the drain line could be blocked.

How to Fix a Blocked Condensate Drain

If the above signs of a blocked AC drain line are positive, follow these steps to unclog the condensate drain line:

  1. Turn off the AC.
  2. Draw out the water standing in your AC’s drain pan using a sponge to soak and squeeze it out into a bucket. Some models may have a drain cap that you can open and let the water drain into a bucket.
  3. Remove the water standing in the drainpipe by sucking it with a shop vacuum, otherwise, let it flow out when the next step is performed.
  4. Use a piece of long thin wire to pull out any objects from the drain line. Start with the outside exit pipe and try the pipe from the inside if this does not work. You can also use a plumber’s snake if you have one.
  5. Once the condensate drain line is clear of blocking objects, throw a mixture of warm water, vinegar, and a bit of kitchen detergent into the drain pipe. This will get rid of any dirt stuck on the pipe.
  6. Reinstall any parts that were detached and turn the AC power back on. Monitor to see if the leak is resolved.

Frozen Evaporator Coil

Poor airflow due to dirty air filters, wrong-sized ductwork, faulty fan blower, refrigerant issues, or dirty evaporator coil can cause the evaporator (cooling coil) in your Panasonic AC to freeze up. As a consequence, there will be extra water dripping down into the AC’s drain pan as the ice melts slowly. 

How to Detect Frozen Panasonic AC Evaporator Coil

If you suspect that the cooling coil in your Panasonic AC is frozen, confirm your diagnosis by following these steps:

  1. Turn the AC power off at the circuit breaker.
  2. Lift the front panel of the AC’s indoor unit and pull it towards you to remove it. This exposes the air filters. 
  3. Remove the air filters by the tabs at the bottom and pulling the filters towards you to take them out. You will then see the evaporator coil.
  4. Check the evaporator coil for signs of ice buildup.

How to Fix Frozen Panasonic AC Evaporator Coil

If your Panasonic AC has a frozen evaporator coil, leave it turned off until all the ice has melted. You can speed up the melting process by setting your AC on High speed fan mode for 15 minutes.

Panasonic Air Conditioner Making Noise

If your Panasonic air conditioner is making abnormal noise, the fan motor could be defective, the evaporator coil could be dirty, some AC parts may be loose/broken, or poor installation was done. Loose AC parts are more common. Ensure the noise is not from normal operation before calling an AC pro.

Normal Panasonic air conditioner noises can be caused by:

  • Refrigerant flow that makes sounds similar to flowing water.
  • The contraction and expanding of AC parts that sounds like cracking when the AC is turned on and temperatures change.
  • The fan’s activity in airflow control that could make a buzzing or ticking sound.

If you have abnormal noises in your Panasonic AC, they could be caused by one of the issues discussed below.

Defective Fan Motor

The Fan in your indoor Panasonic AC unit is always running when the cooling process is on. With time, this can cause wear and tear. A worn-out or faulty fan motor can cause abnormal noises in your Panasonic AC.

How to Diagnose a Defective Panasonic AC Fan Motor

You will need to open the electrical compartment of the indoor unit and remove it to assess faults in your Panasonic AC Fan Motor. This involves a lot of disassembling, and it’s best done by an experienced HVAC technician.

How to Fix a Defective Panasonic AC Fan Motor 

Call an expert Panasonic AC pro to assess and replace a defective fan motor. Do not do try-and-error troubleshooting.

As can be seen in these 12 steps on How to Replace Fan Motor in Panasonic AC, this is a complex and rather technical process and should be carried out by an expert. We can connect you with a reliable Panasonic HVAC pro once you fill and submit the form at the bottom of this article. 

Dirty Evaporator Coil

An evaporator coil removes heat from the air in your Panasonic AC. If the evaporator coil is dirty, heat from the cooling process is released poorly and the coil that’s covered with dirt acts as insulation to retain the cool in the air inside, causing the coil to freeze up. A frozen evaporator coil can cause a rattling noise as the ice weighs on the coils.

How to Diagnose Dirty Panasonic AC Evaporator Coil

Follow these steps to check if your Panasonic AC evaporator coil is covered with dirt:

  1. Turn the AC off and unplug. Wait for it to cool.
  2. Lift the front panel and pull it towards you to take it out.
  3. Take out the air filters from the AC by pushing them lightly upwards by the tabs at the bottom and pulling the filter towards you one at a time. This exposes the evaporator coil.
  4. Assess the evaporator coil for dirt buildup. 

How to Clean Dirty Panasonic AC Evaporator Coil

The Panasonic AC manufacturer recommends you follow these steps to clean dirty AC cooling coils:

  1. Turn the AC off and unplug. Wait for it to cool.
  2. Lift the front panel and pull it towards you to take it out.
  3. Take out the air filters from the AC by pushing them lightly upwards by the tabs at the bottom and pulling the filter towards you one at a time. This exposes the evaporator coil.
  4. Use a soft brush to get rid of the dirt on the coils using an upward-downward motion. You can improvise by using a toothbrush if you don’t have another brush.
  5. Use a low-pressure water hose to splash water on the coil, ensuring you do not send any water to the wall. The dirty water should drain directly into the drain pan and out through the drain pipe. (See steps 3 & 4 of this Panasonic guide on How to Service Your Air Conditioner at Home).
  6. Allow the evaporator coil to dry and use a soft cloth to wipe any dirt on the AC frame or the outer panel in the meantime.
  7. Put the filter and front panel back in place and resume the cooling process.

Improper AC Installation/Loose AC Parts

A Panasonic AC that’s poorly installed or has loose parts will be wobbly when running, causing abnormal noise. Loose AC parts can be the front panel, air vanes, or fan. Poor installation that causes shaking could be triggered by leaving out some of the installation screws or mounting the AC on a weak or uneven wall.

How to Diagnose Improper Installation/Loose Panasonic AC Parts

Look around your Panasonic AC indoor unit for signs that some parts of the AC are improperly installed, loose, or broken. 

Check also that the wall onto which the indoor unit is mounted is firm and level.

How to Fix Improper Installation/Loose Panasonic AC Parts

Ensure that your AC is installed by an authorized dealer or a reliable HVAC pro right from the beginning and that the Installation instructions on the Service Manual of your Panasonic model are strictly followed. 

If errors have been made or some parts are loose due to consistent shaking, you or an HVAC pro should perform one of the following as the case requires:

  1. Secure into place any screws that may have been left out during the installation process.
  2. Tighten any loose parts on the AC unit and repair any that could be broken.
  3. Avoid using parts or accessories that are not designed for the Panasonic AC model, even when replacing parts.
  4. Move indoor parts that are mounted on unleveled or weak mounting wall to a level, more solid, and strong position. Reinstalling your Panasonic AC will require the expertise of an authorized dealer or an HVAC expert to avoid repeating the same mistakes. We can send you a reliable Panasonic AC installation expert as soon as you fill and submit the form at the bottom of this article.

Panasonic Air Conditioner Light Flashing/Blinking

If your Panasonic air conditioner light is flashing/blinking, it could be normal operation in the standby mode or for malfunctions like patrol operation to detect AC dirt level and abnormal e-ion discharge. Blinking AC light also comes with error codes. Call an HVAC expert for malfunctions. 

Panasonic Air Conditioner Flashing Red Light

Panasonic air conditioner red light flashing is an indication that the AC is in “Patrol Function”. This means that the patrol sensor has been activated to detect the level of air dirtiness in the AC. 

This function can show 3 different outcomes:

  • Patrol Blue Light flashes when the air is clean (level of air dirtiness is 0).
  • Patrol Orange Light flashes when the level of air dirtiness is moderate.
  • Patrol Red Light flashes when the level of air dirtiness is high.

When your Panasonic AC red light is flashing, turn on the AC and clean the air filters. If the issue is not resolved, call an HVAC expert for professional service.

Panasonic Air Conditioner Green Light Flashing

If the Panasonic AC green light is flashing fast (0.5 seconds ON and 0.5 seconds OFF) the AC is operating on the Hot Start, indoor residual heat operation, operation mode judgment, Deice operation, or ON timer sampling.

If the Panasonic AC green light is flashing slowly (2.5 seconds ON and 0.5 seconds OFF), the AC is on standby mode.

Panasonic Air Conditioner Power Light Blinking

Panasonic air conditioner power light blinks during the Hot Start, indoor residual heat operation, operation mode judgment, Deice operation, or ON timer sampling.

The power light will also blink when the AC is on standby mode.

Panasonic Air Conditioner Timer Blinking/Timer Light Flashing

Panasonic air conditioner timer light blinks or flashes when there is an abnormal operation of your Panasonic AC and the unit stops operation.

The timer LED will also blink when several Error Codes are displayed on your Panasonic AC:

  • Error Code F91 – Refrigeration cycle abnormality error.
  • Error Code F95 – Outdoor cooling high-pressure protection error.
  • Error Code F96 – Power transistor module overheating protection error.
  • Error Code F97 – Compressor overheating protection error.
  • Error Code F99 – Outdoor direct current (DC) peak detection error.

Call an HVAC expert to resolve the AC issue displayed by the timer blinking light and the error code.

Panasonic Air Conditioner Blue Light Flashing

Panasonic air conditioner blue light flashing is an indication that the AC is on the “e-ion check mode”. 

The Active e-ion Air Purification System is an advanced air purification system in your Panasonic AC. When it is not working properly and there’s abnormal discharge at the filter, the blue (e-ion) light starts blinking immediately.

Call a Panasonic HVAC expert to resolve the abnormal e-ion discharge issue.

Panasonic Air Conditioner Blinking Orange Light

Panasonic air conditioner blinking orange light is an indication that there’s an “abnormality in the AC’s operation.” 

A blinking orange light (timer light) on your Panasonic AC will also appear with some error codes such as error code F99 or F96.

A trained HVAC should address the issue causing the Panasonic AC orange light to blink.

Panasonic Air Conditioner Timer Not Turning Off

If your Panasonic air conditioner timer is not turning off, the remote control clock is faulty or more than one timer has been set. Both causes can easily be resolved by correcting the settings.

Note that the TIMER indicator is always ON once it has been set and repeats daily. So, a timer that’s not turning off here means the AC is running out of the intended timer settings, which may be caused by one of the following:

Faulty Remote Control Clock

Your Panasonic air conditioner’s timer operation works with the clock settings on the remote control and repeats every day once it’s set.

If the clock settings on your remote control are faulty, the timer may run when you do not intend it to, which could mean continuously without turning off.

How to Fix Faulty Panasonic AC Remote Control Clock

Reset the remote control clock to the correct current time by following these steps:

  1. On the remote control, press the Clock button.
  2. Set the current time.
  3. Confirm clock settings.

Multiple Timer Settings

You can set more than one timer settings on your AC. Once a timer operation is running, the upcoming timer displays and is then activated in sequence. 

So, if there is no time allowance between the multiple timer settings the timer will not be turning off.

How to Fix Unwanted Panasonic AC Multiple Timer Settings

You can fix unwanted Panasonic AC multiple timer settings by canceling the current timer settings and setting the timer as desired.

To cancel the timer:

  1. Select the ON or OFF option on the timer section of your Panasonic AC remote control.
  2. Press the CANCEL button.

To set the timer:

  1. Select the ON or OFF option on the timer section of your Panasonic AC remote control.
  2. Set the time for the ON or OFF timer.
  3. Confirm the timer.

Panasonic Air Conditioner Error Codes/Fault Codes

If your Panasonic air condition is displaying error/fault codes, the AC self-diagnosis has detected a malfunction in the outdoor fan motor, the indoor-outdoor signal transmission is defective, there are freezing issues, or there’s a cooling high-pressure abnormality among many other malfunctions. 

While few of the error codes displaying on your Panasonic AC can be resolved by the user through troubleshooting, most of these error codes will require the service of a professional HVAC technician.

The following are some of the common error codes that might appear on your Panasonic AC when malfunctions occur.

Panasonic Air Conditioner Error Code H97

Error code H97 on your Panasonic AC is an “Outdoor fan motor – DC motor mechanism locked” error. It occurs when the rotation speed of the fan motor is abnormal.

The malfunction displayed by error code H97 can be caused by:

  • A short circuit inside the fan motor winding that causes the operation to stop.
  • A broken wire inside the fan motor that caused the operation to stop.
  • Broken fan motor lead wires causing the operation to stop.
  • A malfunction of the Hall IC which causes the operation to stop.
  • A defective power control board of the outdoor unit that causes the operation error. 

How to Fix Panasonic AC Error Code H97

Call a professional HVAC expert to resolve the issue by following these Panasonic troubleshooting instructions:

  1. Switch off the AC power supply.
  2. Open the fan compartment and rotate it by hand. If the fan rotates easily, turn the AC on and run the fan. If the fan rotates check the rotation feedback from the fan motor.
  3. If the fan does not rotate, check the output of the fan motor on the indoor unit power control board. 
  4. If the fan motor supply voltage is generated, replace the fan motor. If not replace the power control board.

Panasonic Air Conditioner Error Code H11

Error Code H11 on your Panasonic AC is an “Indoor/outdoor abnormal communication” error. This error is a signal transmission error displayed when during air conditioner startup and operation of both the heating and cooling processes, the data signal received from the outdoor unit by the indoor unit is abnormal.

Error code H11 on your Panasonic AC can be caused by:

  • Faulty indoor or outdoor units power control boards.
  • Wrong wiring in the indoor-outdoor unit signal transmission line.
  • A broken wire in the connection of the indoor-outdoor unit signal transmission line.
  • A disturbed power supply waveform in the indoor-outdoor unit signal transmission line.

How to Fix Panasonic AC Error Code H11

Call a Panasonic HVAC expert who will follow these Panasonic troubleshooting steps to resolve the issue:

  1. Switch the AC power off.
  2. Check the indoor-outdoor unit connection wires and determine if there is a wiring error or the electronic stability control of both the indoor and outdoor unit power control boards is defective.
  3. Correct an existing wiring error if that is the case, or
  4. Replace a faulty indoor or outdoor power control board.

Panasonic Air Conditioner Error Code F95

Error Code F95 on your Panasonic AC is a “Cooling high pressure abnormality” error. The error code is displayed when, during cooling, a high temperature of 61˚C (141.8˚F) is detected on the outdoor unit heat exchanger by the outdoor pipe temperature sensor

Error code F95 on your Panasonic AC can be caused by these malfunctions:

  • An air short circuit at the indoor unit.
  • Accumulation of dust on the indoor unit heat exchanger.
  • A closed 2/3 way valve.
  • A faulty outdoor unit fan motor.
  • Excess supply of refrigerant.
  • A clogged or frozen expansion valve or strainer.
  • A defective outdoor pipe temperature sensor.
  • A faulty outdoor unit power control board.

How to Fix Error Code F95 on your Panasonic AC

Call an HVAC pro to resolve the issue by following these Panasonic troubleshooting instructions:

  1. Check the outdoor air passage for an air short circuit. If that is the case, ensure sufficient air should be provided.
  2. Check for dust accumulation on the outdoor unit heat exchanger and clean it if that is the issue.
  3. Check if the 2/3 way valve is closed and open it if that is the case.
  4. Check if the fan in the outdoor unit is operating normally and make the necessary repairs or replacements.
  5. Check if the refrigerant levels are normal. If not, evacuate refrigerant and recharge AC with correct refrigerant levels.
  6. Check if the expansion valve or strainer is clogged or frozen and replace either of them as the case requires.
  7. Check if the outdoor pipe temperature sensor conforms to the sensor characteristics chart (see the Electronic Circuit Diagram of the indoor and outdoor units in your model’s Service Manual). If the pipe temperature sensor conforms to the sensor characteristics chart, proceed to replace the compressor. If not, replace the power control board.

Panasonic Air Conditioner Error Code H00

Code H00 on your Panasonic air condition is a normal operation code reporting “no memory of failure” in your AC when the timer button on the remote control is pressed and the signal is transmitted to the main unit.

When this happens, the LED lights turn on and three beeps are heard.

How to Fix Error Code H00 on your Panasonic AC

Since this is a normal operation code, your Panasonic AC resumes normal operation after the 3 beeps are heard.

Panasonic Air Conditioner Error Code H19

Error code H19 on your Panasonic air conditioner is an “Indoor fan motor – DC motor mechanism locked” error. The error code is displayed when an abnormal indoor unit fan motor speed of > 2550rpm or < 50rpm is detected by the Hall IC sensor.

Error code H19 on your Panasonic AC can be caused by these malfunctions:

  • A short circuit in the fan motor winding causing the operation to stop.
  • A broken wire inside the fan motor that causes the operation to stop.
  • Broken fan motor lead wires causing the operation to stop.
  • A malfunction of the Hall IC sensor which causes the operation to stop.
  • A defective power control board of the indoor unit that causes the operation error. 

How to Fix Error Code H19 on your Panasonic AC

Call a professional HVAC expert to resolve the issue by following these Panasonic troubleshooting instructions:

  1. Switch off the AC power supply.
  2. Open the fan motor compartment of the indoor unit and rotate the fan motor by hand. If the fan rotates easily, turn the AC on and run the fan. If the fan rotates when you run it again, check the rotation feedback from the fan motor.
  3. If the fan does not rotate smoothly, check the output of the fan motor on the indoor unit power control board. 
  4. If the fan motor supply voltage is generated, replace the fan motor. If not, replace the power control board.

Panasonic Air Conditioner Error Code H99

Error Code H99 on your Panasonic air conditioner is an “Indoor freeze prevention/protection” error that occurs during the Cooling or Soft Dry mode. This error code is displayed when the indoor pipe temperature is below 2˚C.

Error code H99 on your Panasonic AC can be caused by these malfunctions:

  • An air short circuit at the indoor unit.
  • A clogged indoor unit air filter.
  • Accumulation of dust on the indoor unit heat exchanger.
  • A closed 2/3 way valve.
  • A faulty indoor unit fan motor.
  • Low refrigerant levels due to a leak.
  • A clogged expansion valve or strainer.
  • A faulty indoor pipe temperature sensor
  • A faulty indoor unit power control board.

How to Fix Error Code H99 on your Panasonic AC

Call a Panasonic HVAC expert to fix the issue by following these Panasonic troubleshooting instructions:

  1. Turn off the AC.
  2. Check the outdoor air passage for an air short circuit. If that is the case, sufficient air should be provided.
  3. Check the air filter(s) for dirt and proceed to clean if that is the case.
  4. Check for dust accumulation on the indoor unit heat exchanger and clean it if that is the issue.
  5. Check if the 2/3 way valve is closed and open it if that is the case.
  6. Check if the fan in the indoor unit is operating normally and make the necessary repairs or replacements. (Replacement could be done to the indoor unit PCB if the issue originates from there).
  7. Check for gas leakage and if oil is oozing from the 2/3 way valve and proceed to repair the pipe flare or union nuts if that is the issue.
  8. Check if the refrigerant levels are normal. If not, evacuate refrigerant and recharge AC with correct refrigerant levels.
  9. Check if the expansion valve or strainer is clogged or frozen and replace either of them as the case requires.
  10. Check if the indoor pipe temperature sensor conforms to the sensor characteristics chart (see the Electronic Circuit Diagram of the indoor and outdoor units in your model’s Service Manual). If the indoor pipe temperature sensor conforms to the sensor characteristics, proceed to replace the indoor pipe temperature sensor. If not, replace the power control board.

Panasonic Air Conditioner Error Code F99

Error Code F99 on your Panasonic AC is a “DC peak detection” error. This error code is displayed when during air conditioner startup and operation of both the heating and cooling modes, faulty inverter DC peak data is detected by the outdoor internal DC peak sensing circuitry.

Error code F99 on your Panasonic AC can be caused by these malfunctions:

  • A DC peak caused by compressor failure.
  • A DC peak caused by defective power transistors.
  • A DC peak caused by a defective outdoor unit power control board.
  • A DC peak caused by a short circuit.

How to Fix Error Code F99 on your Panasonic AC

Call a Panasonic HVAC expert to resolve the issue by following these Panasonic troubleshooting instructions:

  1. Reset the AC by turning it off and on again to see if the error code is resolved.
  2. If there is no sound when the AC restarts and the compressor does not turn on, there is an outdoor electronic circuit defect caused by a power transistor short, and the outdoor unit PCB should be replaced.
  3. If there’s a sound when the compressor restarts but the vibration is uneven (is very vibrant), there could be an amplification IC defect, a defect in the microcontroller, or a diode defect. The outdoor unit power control board should be replaced in that case.
  4. If the compressor restarts and the vibration is even but the error code is still there, there could be an excess amount of refrigerant discharged. Evacuate refrigerant and recharge copper coils with the correct levels.
  5. If the compressor restarts but stops after 2 or 3 minutes, or there is abnormal noise in the compressor, check the compressor for winding resistance and replace it if it has shorted.

Note: Error codes can be unique to specific Panasonic AC models. Consult the Panasonic AC Service Manual that has your AC model listed among those covered by the manual.

Alanna Greene

Alanna is an avid traveler who lives in Michigan. In addition to writing for Temperature Master, she also sells crafts on Etsy and takes long walks through the forests near her home.

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