The Fix: Pilot Light to Gas Fireplace Won’t Stay Lit So you’ve checked your pilot light and even reset it, but still, it wont stay lit. This can be an indication that your fireplace thermocouple is either bad or worn out.

Why does my gas fireplace light and then go out?

Fixing the pilot light may just require that you replace the fireplace thermocouple. There’s a possibility that this component has gone bad or is simply worn out from prolonged use. If the problem doesn’t reside with the thermocouple, then it’s likely that the issues are stemming from a thermopile.

Why does my fireplace keep go out after a few minutes?





If you get dust in the pilot assembly and the pilot needs to be cleaned out, it produces a “lazy” flame, which will be disturbed by the draught of the main burners. The flame lifts away from the thermocouple and causes the temperature on the tip of the thermocouple to drop. This, in turn, makes the gas valve shut off.

How do you fix a gas fireplace that won’t stay lit?

The thermocouple and thermopile are the two most common reasons why a gas fireplace won’t stay lit. However, there are other possibilities out there. Another common culprit is incorrect gas pressure. As the seasons pass, you may find that your gas pressure drops below where it needs to be.

Why does my gas fireplace randomly shut off?

Oxygen Sensor Issue



Most gas fireplaces have oxygen sensors that aim to make sure there is a sufficient amount of oxygen in the room. If your oxygen sensor is faulty, it will likely think that there is low oxygen in the room and turn your fireplace off.

How do I know if my thermocouple is bad on my gas fireplace?


Quote from Youtube video: Up next with your voltmeter probes in place light the pilot light and keep the knob depressed. Since your thermocouple is disconnected from the valve the pilot will not stay on unless you keep holding

How much does it cost to replace a thermocouple in a gas fireplace?





between $150 and $250

When replacing a thermocouple or thermopile with the help of a professional, you can expect to pay between $150 and $250.

How do I clean the thermocouple on my gas fireplace?

How to Clean a Thermocouple on a Gas Fireplace [3 Steps]

  1. Step 1: Leave the gas to cool first if it has been burning.
  2. Step 2: Polish the thermocouple.
  3. Step 3: Blow it out.
  4. Step 4: Light the gas.