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Weber Grill Not Getting Hot? 8 Causes (+ How to Fix)

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Weber is one of the top names in the grilling industry, but there’s no denying that their grills can experience heating malfunctions from time to time. Fortunately, Weber makes it easy to handle all of the potential problems on their grills – including the issue of the grill not getting hot enough.

If your Weber grill isn’t getting hot enough, here are the probable causes:

  • Bypass mode
  • Bad regulator reading
  • Blocked or broken burners
  • Fuel leaks and hose problems
  • Damaged igniters
  • Low propane levels
  • Misused grill vents
  • Temperature sensor malfunctions

In this post, we’ll break down the eight most common reasons your Weber grill isn’t getting hot enough. We’ll also add detailed solutions and replacements for each of them.

Bypass Mode Stops It From Heating

Weber grills are known for going into bypass mode whenever there’s a gas-related issue. The bypass mode is designed to prevent gas leaks, excessively large flames, and similar safety risks. However, it triggers quite often due to improper igniting and a handful of other causes. The good news is that it’s easy to reset.

Note: The bypass mode shouldn’t be overlooked if it triggers too often. If it continues, you should look for a gas leak somewhere in the line. There could be a leak in the hose, connections, regulator, or propane tank. Locate and repair the leak before igniting the grill to prevent fires and sparks from worsening.

How to Fix

Weber explains the bypass mode reduces the gas flow down to 10%. Follow the instructions below to turn off this setting.

  1. Open the grill to let the bypass mode know you’re going to use it.
  2. Slowly open the propane tank’s valve (don’t go too quickly, or the bypass will trigger).
  3. After about 10 seconds, turn each ignition switch to high.
  4. Close the lid and wait for a few minutes for the heat to build up, then open it to see if it’s hot enough.

The bypass mode is a safety feature. If it keeps happening, look for a leaky hose or loose connection.

The Regulator Isn’t Working

According to Virtual Weber Gas Grill, the regulator can malfunction if you turn on the igniter too quickly. Much like the bypass mode on a Weber grill, the regulator prevents gas overflows and leaks from leading to fires. However, they can drop the gas levels going to the grill. This process stops the flames from getting big enough to heat the food.

The regulator is attached to the propane tank. It’s a circular meter on top of it, and it’s hooked to the hose that goes to the grill. Propane grills can’t get hot enough if they have a tripped regulator valve, especially since Weber’s also has the aforementioned bypass mode. If both of them are activated (the bypass mode and regulator), you won’t get nearly enough heat.

How to Fix

The propane tank regulator typically has to be replaced. If it’s not connected all the way, it’ll signal a leak and reduce the gas flowing to the grill. Once you’ve tightened the regulator and hoses, check the reading again. If it’s still a low reading, it’s time to get a new one.

Here’s how you can do it:

  1. Get a propane regulator, such as the GasOne Regulator and Hose. This combo has a four-foot hose that includes a gas pressure meter, regulator, hose, and all of the connections you need. It also has a heavy-duty banded interior to prevent it from bending, breaking, or leaking.
  2. Turn off all of the burners on your Weber grill and the valve on your old propane tank regulator.
  3. Remove the hose from the grill and wait for the remaining gas to flow out of it.
  4. Twist off the old regulator and twist on the new one, keeping the valve closed until it’s tightened.
  5. Connect the hoses on both sides, then slowly open the propane tank’s valve to let the gas go to the grill.
  6. Turn on the burners as you usually would and start grilling.

Burner Blockages or Damages

One of the most common reasons Weber grills don’t get hot is that there’s too much debris on the burners, drip trays, and grill grates. The excess oil and food clog the burners, which stops them from sparking. The gas will flow through the grill, but without a spark, it won’t be able to ignite and create a flame.

The burners might let a little bit of gas through. If this happens, your grill will get a bit warm but never hot enough to cook the food. Too much debris on the grates and trays won’t let the heat rise. The heat might also go through the vents before it can read the food.

How to Fix

It’s best to clean your grill after each use. If you can’t follow this routine, try to clean it every couple of weeks. A short scrub down can make a significant difference. Your grill will heat better, turn on quicker, and the food won’t taste ashy.

Keep these tips in mind:

  • Remove all of the components inside of the grill to clean them efficiently. This includes the drip tray, grill grates, burners, and anything else that can be removed.
  • Scrub everything with a stiff brush, then wash it with warm water and a soft sponge. Make sure you don’t get water inside of the burners or on the wires.
  • Let everything dry before putting it back into the Weber grill. The last thing you want is for the water to drip into the burners and prevent them from lighting.

Fuel Is Leaking or Clogged

Is the propane tank’s hose kinked or bent? SFGate shows a minor bend can make a world of difference by limiting the amount of propane that gets to the Weber grill. Unfortunately, unbending the hose usually isn’t enough to handle the problem. Once the bend forms, it weakens the material and leads to leaks.

A bent or kinked hose can trigger the bypass mode or regulator on your Weber grill. The limited gas flow makes the sensors think there’s a leak. For this reason, it’s important to replace the hoses as quickly as possible. You wouldn’t want to replace everything else only to realize the hoses were the culprit.

How to Fix

Look for bend marks or kinks in the hose beneath the grill. This hose leads to the propane tank, so a minor blockage will drastically slow the gas flow. Turn off all of the burners before you replace the hose, and don’t forget to close the regulator valve.

When you get a new hose for your propane tank and grill, make sure it’s long enough to connect to both of them. If the hose is too long, it’ll bend and warp over time. Most Weber grills work well with a four-foot hose.

Unscrew the old hose on both sides, then twist on the new hose. Many hoses have regulator valves on them, so you can get two parts replaced simultaneously.

Worn Igniter Switch

The igniters on your Weber grill are made to spark the gas coming through the burners. Each igniter has wires running to the control board. The igniter is connected to the switch on the other end, which is what you turn to start the grill. If the switch, wires, control board, or igniter are worn or damaged, the flame won’t get hot enough.

The easiest way to know if the igniter needs to be repaired or replaced is to turn it and listen for a ticking sound. If there’s no spark and the burners are clean, the igniter is damaged. You can also use a multimeter to test both wires going to the control board from the igniter. If they don’t have power, they need to be replaced.

How to Fix

This is how you replace a Weber grill’s ignitor switch:

  1. Turn off the grill.
  2. Remove the igniter wires from the control board (they can be traced from the back of each igniter switch).
  3. Remove the switches and unscrew the faceplate from the grill.
  4. Pull the igniter out of the slot, then install the new one.
  5. Connect the wires from each igniter to the previous igniter’s position on the control board.
  6. Screw the faceplate back onto the grill and attach the igniter switches back where they were.
  7. Turn on the grill and test one igniter at a time, listening for ticking or sparking sounds.

Tom Tom’s Product Reviews provides a helpful video guide for the process:

Not Enough Propane in the Tank

Check how much propane is left in the tank every so often. You can weigh it on a scale or check the regulator on top of it. Some regulators display how much gas is left, letting you know when it’s time to replace or refill the tank. When there’s not enough gas, the flow will be limited, lowering the flame and internal heat of the grill.

How to Fix

The only way to fix this problem is to get your propane tank refilled or get a new one. Most propane tanks are about 20 pounds when they’re full and only a few pounds less when they’re empty. It’s often hard to tell the difference just by holding it, so use a scale or ask a local store or gas station for assistance.

Propane tanks last for a long time, so it’s unlikely that you’ll have to replace the tank too often. Refilling the tank is significantly cheaper. If your tank has leaks or is scuffed all over the place, it might be time to get a new one. You can store extra propane tanks as long as you want since propane doesn’t expire.

The Grill Vents Are Open Too Wide

The vents are located on top of the grill. Some Weber grills have side vents, though they’re uncommon. These vents are added to bring oxygen into the grill, helping the flame stay lit. However, too much airflow will leak the heat out of the grill. If they’re closed all the way, your grill might not have enough oxygen to heat properly.

How to Fix

All you have to do is open the grill vents a little more or a little less. Test how well the grill heats when they’re slightly open, then make the necessary adjustments. If your grill’s vents are jammed, rusted, or corroded, you’ll have to get new ones.

Installing a new set of grill vents is as easy as unscrewing the old ones and screwing on the new ones. The vent hinges are prone to locking if they’re left outside when it’s humid or rainy. Open and close them a few times after you use the grill to keep the hinges loose.

Damaged Temperature Sensor

A Weber grill’s temperature sensor shows you what the interior temperature sits at. You can adjust the igniter switches based on the readings. If the sensor is broken or sends false readings, you might not know when or how to change the igniter switches. Some broken sensors don’t move, so it’s important to know if they have to be replaced.

Note: Not all Weber grills have temperature sensors. If yours doesn’t, you can purchase and install a low-cost thermostat to monitor the heat. Remember to test and repair the thermostat if the temperature isn’t reading correctly. It’s best to have a spare thermometer to check if it’s providing the same temperature.

How to Fix

If your grill doesn’t have a sensor, install one that fits inside of it. There are dozens of grill sensors, but it’s important to ensure that they can go inside rather than measure the surface temperature.

Weber grills with thermostats connect to the control board, much like all other electrical components in the grill. Follow this method:

  1. Turn off the grill.
  2. Locate the wire going to the thermostat and unplug it.
  3. Unscrew the thermostat, then tighten the new one in its place (make sure it’s recommended by the manufacturer).
  4. Plug the new thermostat’s wires into the control board.