Heat N Glo Fireplace Turns Off By Itself [7 Easy Fixes]

Heat N Glo turns off by itself? This can be caused by many possible issues.

The most common problems that can be why your Heat N Glo heater keeps shutting off are a bad thermocouple, tripped high-limit switch, inadequate combustible air, bad heating element, low gas pressure, bad thermostat, and tripped circuit breaker. 

heat n glo fireplace turns off by itself

Keep reading our Heat N Glo fireplace troubleshooting guide to get your heater up and running ASAP.

Table Of Contents

Heat N Glo Fireplace Turns Off By Itself [7 Easy Fixes]

In this section, we will explore in-depth the possible reasons why your Heat And Glo fireplace keeps turning off. You can find here the simplest solutions that we have to offer regarding this matter as well.

Note: You can also read the Duraflame Infrared heater troubleshooting guide.

1. Defective Thermocouple

In case your gas fireplace shuts off after a few seconds of lighting the pilot, it can be that you have a bad thermocouple. 

When you see Heat And Glo pilot on but won’t start the burner, you can be pretty sure that the flame sensor or thermocouple is faulty. Thus, it is not detecting the pilot flame and releases gas from the gas valve as it should light the burner.


Test the thermocouple with a multimeter. If you get a reading that is not close to zero, your heater’s thermocouple is defective. The procedure for removing the thermocouple is outlined below.

  • To begin, turn the gas valve located in front to the off position. Give sufficient time for the heater to cool.
  • After that, place a tarp in front of the fireplace. Remove the ornamental logs and set them on the tarp.
  • The screw that keeps the thermocouple in position must now be loosened. This can be found on the gas valve’s backside. Use a wrench.
  • Finally, remove the thermocouple’s end from the back of the valve, totally detaching it from the device. To remove it, you’ll have to pull it through the mounting bracket.

2. Tripped High-Limit Switch

The high-limit switch is a safety device that shuts off the fireplace when it is dangerously overheated. This not only prevents accidents but also protects the unit from damage.

For some reason, if your high-limit switch is triggered your Heat N Glo fireplace will shut off automatically.


You need to reset the high-limit switch and restart the heater. If the high-limit switch trips again, the following things should be checked-

  • The blower must be running.
  • Ensure that your air filter is clean. A dirty air filter can result in low airflow causing the heater to overheat.
  • Inspect that the exhaust is clear. You want the excess heat to leave the fireplace.
  • Next, move any solid objects that may be blocking airflow to your heater.

Your fireplace should be running okay at this point. If the high-limit switch still trips, it may be defective and need replacement.

3. Inadequate Combustible Air

Sometimes, the reason why your fireplace won’t stay lit can simply be a lack of oxygen for combustion.

It could be that the room you have placed the fireplace in doesn’t have enough ventilation or something could be blocking airflow in the heater.


Open up windows and curtains in the room to let air in. Ensure that the blower is running. If not, you may need to call a licensed professional to replace the blower.

Also, ensure that the air filter is clean and the air intake vent isn’t jammed by anything. Clean up the exhaust to let all the carbon dioxide out, so the flame isn’t snuffed by it. 

4. Bad Heating Element

Your electric heater may be cut off on its own due to a malfunctioning heating element. The heating element works to generate sufficient heat to make your home comfortable.

Due to a faulty heating element, the heater may overheat and activate the overheat safety switch. Hence, your Heat N Glo fireplace turns off by itself.


To begin, determine whether this is the source of your heater’s frequent shut-offs. There are two techniques to test the heating element.

1st Method:

After attaching the heater to a wall outlet, inspect the heating element. Check to see if the heating element has a bright orange light to it. If the heating element emits a dim glow, it is no longer in use.

2nd Method:

Remove the heater from the electrical supply and disassemble it. Examine the resistance of the heating element with a multimeter; a high resistance implies a healthy condition.

If the resistance of your heating element has dropped, you’ll need to replace it straight away.

Replace the heating element if the results show it to be faulty.

5. Low Gas Pressure

Another common reason for fireplaces to shut off automatically is a lack of gas pressure. 


The pressure requirements for Heat N Glo gas fireplaces are given below.

PressureNatural GasPropane
Minimum Inlet Gas Pressure5.0 inches w.c.11.0 inches w.c.
Maximum Inlet Gas Pressure14.0 inches w.c.14.0 inches w.c.
Manifold Pressure3.5 inches w.c.10.0 inches w.c.

Here’s how to test the manifold pressure:

On the inlet and outlet sides of the gas control, a one-eighth (1/8) inch (3 mm) N.P.T. plugged tapping is supplied for a test gauge connection to measure the manifold pressure.

Crack up the tap’s center screw with a tiny flat-blade screwdriver. To obtain the pressure reading, place a rubber hose over the tap.

Throughout any pressure testing, the fireplace and its separate shut-off valve must be isolated from the gas supply pipe system.

Contact your local gas utility company if the pressure testing reveals incorrect gas pressure.

6. Bad Thermostat

Heat N Glo thermostat not working can cause your furnace to turn off abruptly due to temperature misreading. This can happen if your thermostat’s internal gauge is broken.

The thermostat can sometimes perform badly owing to an inadequate location in your home. 

Assume you’ve set the thermostat to a temperature that is typically higher than the rest of the house. This will cause your thermostat to incorrectly identify the temperature.


A multimeter can be used to determine whether your thermostat is in working order or not. If your thermostat isn’t working properly and the multimeter shows an irregular reading, it needs to be replaced.

You can easily obtain Heat N Glo heater parts that are compatible with your heater.

Also, make sure your thermostat is in a location that accurately reflects the temperature of the entire room. It’s not a good idea to put the thermostat near a draft or a hot location.

7. Tripped Circuit Breaker

Many households throughout the world utilize circuit breakers instead of fuses. It’s a single gray box carrying multiple switches that are properly lined up in rows in a typical modern household, with a single primary breaker at the very top.

A tripped circuit breaker will stop power flow to your heater and turn it off. 


Check your home’s circuit box to determine if any of the breakers have been triggered. Turn it back on and test the furnace again if this is the case.

A power outage could be the cause of the problem if it persists.

Distinct levels or rooms are frequently connected to different circuits. Using fewer heaters at once or distributing them across various circuits is a good idea.

Well, watching the video will be helpful for you.


Why does my furnace blower keep turning on and off?

If your furnace’s blower is frequently going on and off the problem is most likely a faulty fan limit switch. The heater fan limit switch is a control device that decides when the blower component in your furnace should turn on and off.

How to Determine if Your Unit Is Short Cycling?

Measuring the interval between when your HVAC system shuts down and then starts up again is one technique to determine whether it is performing correctly or turning on and off intermittently.

How long should a furnace cycle last?

The average operating time for a heater is 10-15 minutes each cycle assuming no extreme conditions are present. If your home has average insulation, your furnace may have to run two to three times per hour to sustain your desired temperature.

What would cause a furnace not to kick on?

First, inspect the air filter for dirt. Filters that are dirty result in insufficient airflow, which can stop the heater from operating. Improper thermostat settings closed gas shutoff, or malfunctioning pilot light is some of the other reasons it won’t start.

Why is cold air blowing when the heat is on?

It’s possible that if a furnace only produces chilly air, the heater has overheated. But don’t worry; this normally does not indicate that the unit is defective. It’s part of the heater cool-off cycle.


Hopefully, you now have the answer to the question, “Why does my Heat And Glo fireplace shut off?” In case you have any confusion, leave us a comment below.

About David

David is a man who loves doing research and finding out the best solution to any type of heating appliance issues like heaters and fireplaces. Whenever he finds the perfect solutions to any issues of heating appliances after doing in-depth research, he loves to share them with his readers. In fact, his aim is to help his readers to fix the issues with their heating appliances easily.More about us .

2 thoughts on “Heat N Glo Fireplace Turns Off By Itself [7 Easy Fixes]”

  1. My Heat N Glo goes out after a period when the using the remote. Stays on if manually turning on the flame by using the toggle switch in the unit. Cause?


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