Goodman Furnace Not Blowing Hot Air? 4 Common Causes + Fixes


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When you depend on hot air blowing through your home during the winter months, the last thing you want is for heating problems to occur with the furnace. A Goodman furnace not blowing hot air means it will get cold in your house. Luckily, finding the problem is often an easy task.

To fix a Goodman furnace not blowing hot air, check the thermostat for dead batteries, make sure all connections to the thermostat are correct, see if the pilot light is lit, and make sure there is no problem with the burners. 

If you are looking for the solution to fixing a Goodman furnace not blowing hot air, then read on. We discuss the possible causes behind this problem, and the article gives you the fixes for each. 

The Thermostat Has Dead Batteries

Different thermostat models exist. Some thermostats require a direct connection to a power source. Other thermostats rather run on batteries. If your thermostat runs on batteries, then you need to replace them frequently. 

When the batteries are drained, it means your thermostat will no longer be able to signal the burner or ignitor to produce a flame. In this situation, you will find that air is not heated as it pushes through the furnace. 

This is a common problem that many people overlook, yet it holds a simple fix that takes a trip down to the local store. 

How To Fix

Fixing a thermostat with dead batteries is easy and shouldn’t take more than just a few minutes. Make sure this is the problem before you head out to buy new batteries:

  1. Take a look at the thermostat. If the thermostat has an LCD, see if it is on. If nothing is displayed on the screen, check that the thermostat is turned on. If your thermostat is an older model without a screen, take a look at the LED lights to get an indication if there may be no power. 
  2. When lights are off, and nothing is displayed on the LCD screen, remove the thermostat from its mount. Open the panel at the back to access the batteries. 
  3. Remove the batteries and take them with you to the shop. Make sure you get the same batteries. Fit the new batteries in the thermostat and see if this solves your problem. 

If you’re having trouble, the video below should help:

Problems With Connections to the Thermostat

Some thermostats do not rely on batteries. Instead, they get power from the main power source that also runs your furnace. 

When this is the case, you need to consider the possibility that there is an issue with the wiring. Even if the furnace has normally been running for some time, wiring issues can still develop. Wires get old and wear out over time. A power surge could cause a wire to burn. There are many possibilities. 

While considering a problem with the power source to the thermostat, also take note that the thermostat connects to specific areas of the furnace. Problems with these cables may cause insufficient heating even if the thermostat is operating normally. 

How To Fix

For this step, start by checking if there is any power on the thermostat. If the thermostat uses a direct power line and does not indicate being turned on, it might be related to the wiring. 

You will need to check the inside of the furnace for this step. Open up the furnace’s panel and take a look inside. Make a note of where the power cable runs toward the thermostat. Now, see if you can find any problems with this wire. 

The issue may be a loose wire, or it may not be properly connected to the furnace. 

Even if the thermostat is on, you can still check for loose or damaged wires. A wire running from the thermostat to the burners may have become damaged. In this situation, the thermostat cannot signal the burner when you change the temperature. 

The Pilot Light Has a Fault

Older furnace models do not use the same electric ignitor you see in modern options. Instead, these models use a part that is called the pilot light. The pilot light needs to be lit. If the pilot light runs into problems, then the burners will not ignite when you turn the furnace on. 

Your furnace relies on the burners when air is heated. If the burners cannot be ignited, it means you will not be able to enjoy heated air flowing through your home. 

Sometimes, the pilot light is simply dirty. There are, however, times where this part of the furnace becomes damaged or faulty.

How To Fix

Start by checking if the pilot light is lit. If it is not lit, see if it is possible to light it manually. When you do this, be sure to use a lighter with a long tip. It will be difficult to reach the pilot light with a small lighter. If you get it to light, see if the air pushed out by the furnace starts to warm up now. 

If this does not help or the pilot light remains dead, you should continue to clean it. The steps will depend on the furnace model you have. Make sure you remove the pilot light carefully to ensure you do not damage it in the process. 

Once removed, use a small piece of paper towel or a cotton bud to clean the part. You should consider using some compressed air to get the dust out of the pilot light’s small areas. 

If you see damage such as cracks, it is best to replace the pilot light completely. 

The video below offers guidance on replacing the pilot light:

Dirty or Broken Burner

Another possible problem that could be why a Goodman furnace not blowing hot air lies with the burners. This is a relatively small structure that is responsible for maintaining a flame. Air flows through the area with the burner, causing it to heat up. 

Dirt can collect on the burner over time. This can cause holes to become blocked, making it harder for ignition to occur. The blocked holes also mean the burner will be less sufficient in providing adequate heating. Sometimes, however, the burner may be broken – in which case a replacement is needed. 

How To Fix

Cleaning the burners is your first step. This will ensure you do not get a replacement if it is not necessary. Use sanding paper to get any debris that is stuck off. The sanding paper should have a very light grit. A can of compressed air or a vacuum cleaner helps you get into the crevices on the burner. 

When cleaning the burner does not help, consider replacing it. It is usually not expensive to replace the burner. Ensure you take note of the burner model number – get an exact replacement to ensure you do not run into compatibility issues. 

Summary

When the thermostat has dead batteries, the burner is damaged, or the ignitor fails to create a spark, you may find that hot air is not blow out by your Goodman furnace. In this situation, the fix may sometimes require the replacement of electrical components. 

When you need to replace parts in the furnace, it is usually best to get a professional for the job. Simply use the form below – fill out a few details, and we’ll help you connect to a reputable HVAC specialist who services your area.

Jake Alexander

Jake is a freelance writer from Pennsylvania who enjoys writing about science and sports. When he's not writing for Temperature Master, he can be found watching the NFL or playing basketball with his friends.

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