To troubleshoot a gas fireplace thermopile issue, first check for any debris or blockages in the pilot light or burner. Next, ensure the gas supply is turned on and the pilot light is lit. If the pilot light won't stay lit, the thermopile may need to be cleaned or replaced. You can also test the thermopile with a multimeter to check for proper voltage output. If these steps don't resolve the issue, it may be best to consult a professional technician for further assistance.
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