All Pro Propane Heater Won’t Stay Lit [4 Easy Solutions]

Every propane heater, whether it comes from the All-Pro or other brands, is a reliable heating method to boil ice-cold situations. Every home loves this heater as it is portable, efficient, and requires less money to operate. 

However, the heater may go through various problems over time- just like other electric appliances. For example, All pro propane heater won’t stay Lit is one of them. 

If this is the problem you experience with your All-Pro Heater, you have come to the right place. Your propane heater will not stay lit if the controller gets defective or the thermocouple gets dirty. 

And this troubleshooting guide will let you know how to fix those issues to let your All-Pro heater function again. 

All Pro Propane Heater Won’t Stay Lit: [4 Easy Solutions]

Like other electric appliances, your All-Pro propane heater may stop working properly. And the following issues we mentioned below are common propane water heater problems every one of us encounters. 

1. Defective Controller

The controller of your heater allows you to turn on or off your heater, let you adjust the temperature, and more. But if it gets defective, your heater will start malfunctioning. In the worst cases, you can’t turn your heater on. 

How To Fix:

If the controller gets bad, you need to replace it. Fortunately, you don’t need to spend a leg and arm to get a new controller. 

2. Defective Thermocouple

A faulty thermocouple is a culprit that may stop your All-Pro propane heater from turning on. The main work of a thermocouple is to keep the pilot light stay lit all time. If it gets defective or dirty, the thermocouple fails to send an electric signal to the gas valve. 

Consequently, the gas valve doesn’t get the signal it needs to allow the valve to open. In simple words, a dirty thermocouple is the reason that causes the pilot light to go out. 

How to Fix:

Cleaning the thermocouple will be an easy fix to allow the thermocouple to function again.  In this case, turn the gas supply off. Find the protective flame screen and pull it out from the unit. Then, take a screwdriver and unscrew the nut that holds the thermocouple with the heater. 

Now, pull the thermocouple and rub it with a sponge until you clean all the dirt buildup. You can also rinse the thermocouple with water. Air-dry the thermocouple once you wash it. Re-install the thermocouple and start the heater to test it. 

If you fail to start your heater, the thermocouple connection may get damaged. So, replace it with a new one. 

3. Dirty Pilot Orifices

Clogged pilot orifices are also responsible for not letting the heater stay lit. If the pilot orifices get blocked by dirt and debris, it will stop the flame from burning. Consequently, the thermocouple fails and the burner goes out. 

How to Fix:

Removing dirt and debris from the pilot orifices is not as simple as cleaning the thermocouple. You need to disassemble the entire unit to tidy up the orifices. We recommend you hire a certified HVAC expert to do this task for you. 

4. Loose or Defective Gas Valve

The gas valve of your propane heater controls the gas pressure. It can lead to a gas leak if the valve becomes loose. Because of the loose gas valve, the amount of gas your heater needs will not flow. It means it will affect the overall heater performance and shut off the heater. 

How To Fix:

Just reconnect the gas valve and tighten it up. You should use a wrench to tighten up the loose gas valve


Why does my propane heater keep turning off?

Your propane heater will keep turning off if the gap between the thermocouple and the flame is too far. Also, a clogged pilot tube is responsible for keeping your propane heater shutting off. 

How do you bypass a thermocouple?

You need to remove the spring mechanism if you want to bypass a thermocouple. Use a screwdriver to pull out the little e-clip and remove the valve to bypass the spring mechanism. 

How do you know if you have a bad thermocouple?

If the flame and pilot light goes out once you release the gas control knob after pressing down the knob for 20-30 seconds, we bet your thermocouple doesn’t perform well. 

How much does it cost to fix a thermocouple?

The average price you need to spend is $150-$250 to fix a bad thermocouple. 

Can a thermocouple be cleaned?

Yes, you can clean a thermocouple by using a sponge or steel wool. 


From top to bottom, we have discussed what causes your All-Pro propane heater to malfunction. Follow each of the troubleshooting steps we mentioned above to fix your heater problems. Don’t hesitate to call the manufacturer support team if you fail to start the heater after trying out every troubleshooting method. 

About William

William is the founder of He has real life practical skills in fixing smoker & heating appliance issues. He loves to share his knowledge & helps others in fixing their appliances & saving their money. William firmly believes that anyone can repair his or her unit with the correct guidance & knowledge. See more at about us.

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