Have a williams wall heater and the thermostat works intermittently, I have to move it on and off several times before the heater turns on.If I touch the thermostat wires together heater kicks on instantly and if I touch the spring in the thermostat heater fires up. I replaced the thermostat but still have the same problem. I checked the milivolts on the thermopile and it's at 450mv, i get the same mv reading at the thermostat connections on the wall. Every where I've read says thermopile is in spec. Went to replace thermopile but everyone I find locally is smaller diameter and screws in, mine is held in with a clip. Are there any other things I should check before trying to hunt down a thermopile that seems to be fine?
source https://hvac-talk.com/vbb/showthread.php?2226194-Wall-heater-thermostat-works-intermittently&goto=newpost
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