Ensure that the gas valve is fully open. Sometimes, the valve might get accidentally closed, cutting off the gas supply and preventing the fireplace from igniting. Checking for blockages or damage in the gas line is also crucial. If the pilot light isn't staying lit, there may be an issue with the ignition system.
Could also be that the pilot is too small (plugged) to heat up the thermopile enough to send enough current all the way to the switch, but enough to light by jumping at the valve. Try tapping the top of the pilot with a screwdriver a few times while it's on to knock out any debris caught inside.
The fireplace not turning on via the switch is likely due to a weak thermopile (flame sensor in the pilot flame) not putting out enough voltage to overcome the resistance in the wiring to the switch. The thermopile generates all the power to operate the gas valve. As they age the voltage output drops.
One of the most common reasons a gas fireplace won't turn on is often an extinguished pilot light. A strong downdraft, an interruption in the fuel line, or a build-up of soot and dust can cause the pilot light to flame out.
The most common cause of this problem is a bad thermocouple. This is the ``tube'' that is in contact with the pilot flame and leads back to your thermostat/gas valve. It is relativly inexpensive and can be found at most hardware stores. I suggest taking the old one with you to ensure that you get the correct one.
One of the most common problems faced by homeowners with gas fireplaces is the pilot light going out or not staying lit. The pilot light is a small flame that ignites the gas burner, which produces the heat for your fireplace — if the pilot light goes out, your fireplace won't work.
If it is not delivering gas with the knob open, then the gas tank may be empty. You need to contact your supplier for a refill. Similarly, if you have piped natural gas, you need to check that the gas knob is on. If there is no gas flow, you'll need to call your utility company to restore proper supply.
Common Signs of a Failing Thermocouple
Here are some common indicators: Difficulty Lighting the Fireplace: If you struggle to light your fireplace, or if it takes several tries to keep the pilot lit, it could suggest that the thermocouple is not sensing the flame correctly and is failing to keep the gas supply open.
Gas fireplace igniter replacement cost
A gas fireplace igniter costs $90 to $150 to replace, including labor. This component uses electricity to ignite the gas and start the fire. Over time, the igniter may stop working from age or damage.
It's easy to know how to turn on a gas fireplace with an electronic ignition wall switch. Many gas fireplaces come equipped with a wall switch control panel for activating the unit and adjusting the level of the flame. Simply push the “On” button and the pilot should ignite.
Anything from issues with your pilot light, clogged ports on burners, damage to heating components, and thermocouple/thermopile malfunctions can be to blame.
Turn the ON/OFF/PILOT knob to the 'OFF' position and wait for five minutes to clear out any residual gas. After waiting, press and hold the ON/OFF/PILOT knob. Then, press the igniter button repeatedly (as per the manual's instructions, usually for about 30 seconds) until the pilot ignites.
If it doesn't click, then the wires may not be connected properly, the battery may be dead or installed incorrectly, or the igniter module may have failed.
The Pilot Lights But Won't Stay Lit
If the flame lights and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds, that's the sign of a thermocouple malfunction.
Thermocouples are designed to detect a pilot light's loss of heat and close the gas valve to prevent a gas leak. Replacing a thermocouple is a relatively easy fix that can take less than two hours.
If the gas is on and the pilot hasn't been lit in a couple of months, you might need to purge the air out of the pilot tubing. To do this, hold the pilot button down for about one to three minutes while the air bleeds out. If the pilot is lighting but not staying lit, it could indicate a worn-out thermocouple.
You start smelling strange odors
This smell should go away after three to four hours of use. A dirty fireplace with excessive pet hair or dust can also produce an odor. If you smell rotten eggs, call for help immediately, as you likely have a gas leak.
Dirty Burners and Obstructed Gas Lines
While moisture and rust are the most likely cause of delayed ignition, dust, dirt, grime, and even lint can accumulate and delay ignition. Delayed ignition can also be caused by a sulfur buildup caused by the process of burning natural gas.
Electrical Issues: Loose Wiring or Faulty Connections
Electrical problems are one of the most common causes of a gas fireplace switch not working. If the wiring is loose or corroded, the signal won't reach the ignition system.
But in general, an efficiently running modern gas fire kept clear of dust and debris should hit or exceed that 10 to 15-year mark before showing signs of wear. Older or cheaper models may start to struggle after 7–8 years. Regular servicing and maintenance will be essential to maximising lifespan potential.