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How to replace thrmocouple on williams 4007732 furnace

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Look on the gas valve you will see a cooper tube with a hex nut on it follow this back to the pilot that's the thermocouple . undo the nut on the gas valve and the one at the pilot and replace the same way as you took it off.

Posted on Dec 17, 2016


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Pilot won't stay on Williams wall furnace 4007732, changed therocouple already

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I have a williams model 4007732 heater. It just stoped working. I replaced the thermo coupler hoping it was the proble. But no, the heater still will not maintain the pilot light. So should I just...

if you have replaced thermocouple make sure your connection to valve is tight enough as i have found new heaters where a slight tighten on connection is all they need if not its the pilot spring inside valve some valve this can be fixed others replace valve altogether an old trick we used to do on solanoids that work similar was to give a tap on the area where slide or spring located it worked sometimes and sometimes only over night so probably easier to change valve in heater, one more thing before you change valve take pilot assembly out and check where pilot flame comes from found spider webs inside before stopping the pilot and in some cases pilot lights but like a lighter straight up missing thermocouple all together and is yellow because oxygen is reduced because of web sounds unbelivable but i ordered a full pilot assembly for a flame fire once changed to new took old one apart and found spider web then talking to the service guy who trained me said it was a common fault for him so it does happen

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