What would cause a gas fireplace not to ignite?

Take a look at your Ignition Switch and ThermocoupleIf the tubing is unobstructed and gas is flowing out, the spark igniter and thermocouple may be malfunctioning. Make sure there isn’t any debris between the two. The igniter may need to be replaced if the pilot light starts but does not stay lit.

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

A professional thermocouple or thermopile replacement will cost you between $150 and $250.

How do you fix a thermocouple on a gas fireplace?

Thermocouple Replacement: Step-by-Step InstructionsThe gas valve should no longer receive any gas supply. Unscrew the thermocouple connector from the gas valve with a wrench, then unhook the probe from its clip and pull out the entire thermocouple assembly. This will release the probe. You can buy a new thermocouple at the hardware store.

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