Question about Williams 2509612 Ceramic Mid-Size Heater

1 Answer

Heater is approximately five years old. Pilot lights as long as I hold in the button. Good flame around thermostat but wont stay lit. Has two wires attaching to the thermostat line which I have never seen before. How can i check the thermostat and/or what are the two wires going to the thermocouple line. I disconnected the wires, looks to be contunity across the wires.

Posted by mitch_thomps on

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Robert Moller

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The thermocouple supplies millivoltage to the gas valve to energize it.
If the thermocouple is bad the valve will not stay open to allow gas, thus
no heat.

Posted on Feb 08, 2011

  • mitch_thomps Feb 08, 2011

    Doesn't tell me how to test it or what are the other two wires connecting to the line.

  • Robert Moller
    Robert Moller Feb 08, 2011

    Thermocouple has two wires which connect it to the gas valve.
    To test it you need a thermocouple tester, but your description
    tells me that it is bad. As far as the other two wires to the thermostat
    does not describe much. Where are they coming from.
    In simplest terms, a thermocouple is a temperature sensor. Normally inexpensive, a thermocouple is standard on some gas heaters. If your thermocouple breaks or you feel it is not working properly, consider replacing it


    rather than installing a new gas heater.

    Begin this project by shutting off the gas control knob on your heater. Once you are sure that the gas is off, you should use a wrench to remove the nut that attaches the thermocouple to the gas heater. This nut should appear to be securing a piece of copper tubing or other type of tubing. With the nut removed, you should also pull down on the tubing, dislodging it from the thermocouple.

    Sometimes there is another nut that attaches the end of the thermocouple to the pilot bracket, if this is the case you should unscrew this nut as well. You can slide it down the tubing and keep it there until you need to replace it.

    With the nuts that were holding the unit in place removed, you should be able to slide the old thermocouple out of the brackets that hold it to the heater. You should then take it to a hardware or home improvement store and find a suitable replacement. Then follow these steps to install the new part and fix the heater.

    To change the thermocouple, you should press the end of the thermocouple into the pilot bracket as far as you can. If you had to remove a second nut to remove the old thermocouple, now is the time to replace that nut securely.

    With the thermocouple in place, you should connect the lead to the control unit. Use the nut you removed in the beginning steps to secure the lead. You should then tighten it at least a quarter turn with a wench to make sure the lead is securely attached to the control unit of the gas heater.

    Now that the new thermocouple is installed on your gas heater, turn on the gas shut off valve that you turned off earlier. You should be able to relight the pilot and the functionality of your gas heater should be restored.

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