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Thread: troubleshoot gas wall heater- thermostat? wire?

  1. #1
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    troubleshoot gas wall heater- thermostat? wire?

    Hi, I have a older (15+years) cozy direct vent gas wall heater with the original manual thermostat wall control (2 wire).

    Last year, the gas valve was replaced after replacing multiple thermopiles ( pilot would go out).

    Its been working fine until last week- the pilot stays on but the gas valve doesn't "open" unless I give the valve a little whack. then the gas valve will be responsive to the thermostat for a bit then non responsive after.

    I tested the thermostat with a jumper cable- no response
    I tested the TH TH/TP on the gas valve with a jumper cable- fired up and then right after tested the thermostat- it fired up.

    Is the issue a faulty gas valve, faulty wire or thermostat?

    I hope the issue isn't the gas valve it was expensive to replace.

  2. #2
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    Clean all connections to bright metal including the wires, clean thermocouple base in the gas valve and reseat it.

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