Heater Won't Turn Off. Should I Replace the Thermocouple?

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My heater turns on, but it never shuts off.  We have to do it manually. I'm hoping to fix this problem on my own.  After I shut off the gas to the valve, can I just take the thermocouple off and buy a replacement somewhere? Or should I take the whole valve off and replace the whole thing? I probably shouldn't be so cheap and should just call a repair guy to replace the dang valve, but I'd like to try it on my own! I enjoy your show.

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I would suggest that a professional make this repair for you. Seeing that the heater is older there can be other issues with it that you may not be aware of. And putting all the hard work in fixing this may be not the best advice I would suggest. The professional can determine if its time to replace the unit or simply repair it.

Your local utility company can check this out for you and many times this evaluation can be done at no cost if you carry a service agreement with them.

The thermocouple is not necessarily the problem with this unit. As all this device does is prove to the gas valve that the pilot light is on and its safe to turn the main gas on for heat.  There is most likely another sensor that runs to the gas valve that senses the room temp and that control is faulty.

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