If your gas fireplace pilot light won't light, first turn off the gas and wait 5 minutes. Then, ensure the gas supply valve is open. Turn the control knob to "Pilot," press and hold it in to release gas, and firmly press the igniter button. Hold the knob in for 30 to 60 seconds after the flame appears so the thermocouple heats up.
If your pilot light is on but the main burner won't ignite, the most common culprits are a dead battery in your remote system, a dirty sensor, or a faulty wall switch.
Replacing a gas fireplace igniter costs between $100 and $350 on average, including both parts and professional labor. If you are handy and purchase the replacement part yourself, you can expect to spend about $10 to $50 for just the component.
To clean a dirty thermocouple on a gas fireplace, turn off the gas supply and allow the unit to cool. Remove the front panel and carefully access the pilot assembly. Gently polish the metal tip of the thermocouple using fine-grit sandpaper, an emery board, or a scouring pad until it is free of soot and carbon.
To manually light a gas fireplace with a standing pilot, locate the control knob (often labeled OFF, PILOT, and ON) and the gas valve, usually behind a bottom grille.
Pilot light issues generally stem from dirty components, safety sensor failures, or disrupted gas and airflow. The most common causes include:
The most definitive sign of a bad gas fireplace thermocouple is that the pilot light will ignite, but it goes out the moment you release the control knob. This happens because the sensor has failed to generate the small electric current needed to keep the gas valve safely open.
No, a thermocouple itself does not have a reset button. It is a simple temperature-sensing rod that generates a tiny electrical charge when heated by a flame.
Steps for Furnace Thermocouple Cleaning
The most common problem with a gas fireplace is pilot light failure or ignition issues, often leaving the unit unable to start. This is typically caused by a dirty pilot assembly, dead batteries in the remote/receiver system, or a faulty thermocouple/thermopile.
Yes, you can absolutely replace an ignitor yourself. Whether it is for a gas oven or a furnace, it is a very common and straightforward DIY repair that requires basic tools like a screwdriver and wire strippers.
PG&E offers free furnace safety inspections and gas pilot relight appointments.
If your gas pilot light won't light, first turn the gas dial to "OFF" and wait 5 minutes for any accumulated gas to clear. Turn the dial to "PILOT," press and hold the reset/gas button, and manually ignite it. Keep holding the button for 30–60 seconds before releasing it.
A gas fireplace typically lasts between 15 to 20 years, though high-end models can push 25 to 30 years with exceptional care. Several factors and individual components impact this lifespan.
Yes, a pilot light in a traditional "standing pilot" gas fireplace is designed to stay on constantly, even when the main burner is not in use, so the fire can ignite instantly. However, many modern fireplaces feature an Intermittent Pilot Ignition (IPI) that only turns on when you operate the fireplace.
Yes, you can absolutely fix a bad thermocouple yourself if you have basic DIY skills. The entire process usually takes less than an hour and only costs between $10 to $20 for the part.
If the thermocouple is bad, the pilot light will not stay lit. While you can manually light the pilot by holding down the gas valve, the flame will extinguish the moment you release it because the faulty thermocouple cannot detect the heat and signal the gas valve to stay open.
To test if a thermocouple is working, the most accurate method is to use a multimeter set to DC millivolts (mV) while applying heat to the sensor tip. If you don't have a multimeter, you can perform a basic visual or reset test.
A gas fireplace thermocouple typically lasts between 3 to 7 years. However, its lifespan heavily depends on usage and maintenance. A clean, strong pilot flame will help the sensor last much longer, while soot buildup or a misaligned flame can cause it to degrade in as little as 1 to 2 years.
Plumbers typically charge between $150 and $250 to replace a faulty thermocouple. While the part itself only costs about $10 to $25, you are primarily paying for a standard diagnostic fee (typically $50 to $150) and the plumber's labor for a service call.
The most common symptom of a bad thermocouple is a pilot light or burner that refuses to stay lit. When you ignite the appliance, the flame may burn while you hold down the gas valve, but the moment you release it, the flame goes out.
The average cost to fix a pilot light ranges from $100 to $250, including parts and labor. A standard diagnostic fee to have a professional inspect the unit costs between $50 and $100.
If your pilot light won't stay lit, the most probable cause is a faulty, dirty, or misaligned thermocouple. The thermocouple is a safety sensor that detects the flame; when heated, it signals the gas valve to stay open. If it can't sense the heat, it shuts off the gas to prevent leaks.
The easiest way to tell if a thermocouple is bad is the "pilot light test": if you light the pilot, hold the valve button down for a minute, and the flame immediately goes out when you release it, the thermocouple is usually failing to sense the heat.