Question about Williams 2509612 Ceramic Mid-Size Heater

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Heats up and shuts off

Wall heater willams 3509622 heats up then shut down pilot too. i change the thermocouple all ready

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  • jAVIER fERNANDEZ Jan 23, 2008

    The heater starts and, afeter a while, it shuts off all, including the pilot. It happens more and more often.

  • jAVIER fERNANDEZ Jan 23, 2008

    The heater starts properly, but after a few minutes it shuts off, including the pilot. It happens more and more often.



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There are 2 things to check. First is the thermostat. Next is the thermal safety switch located up on the heat exchanger. by-pass these one at a time by connecting the wires together. If that solves the problem, change to a new one. If neither one of these items are bad, you need a new gas valve.

Posted on Dec 31, 2007


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Yeah, I've got a solution. SHUT OFF YOUR GAS SUPPLY VALVE FIRST!!! If your pilot won't light or if it lights and kicks off soon then check the orifice. I've got a 30,000 BTU LP gas unit. when my pilot did light, the flame was not totally encompassing the thermocouple nipple which lies behind the sparker/igniter furthest away from the flame. It cause the thermocouple nipple to cool too much and shut off the unit. I took the unit off the wall. I undid the four screws on the back of the unit, which holds the glass front plate. Then I took apart the multi-sectioned brass piece that is attached to the gas feed line for the pilot with a 13 mm and a11mm open end wrench, or you can use a small adjustable and a set of pliers. The second brass piece, the 11mm one, from the gas feed line, is the orifice. It has a tiny little hole in the center. I stuck a pin in it and cleaned it out from some debris that had clogged it. You do not have to take off anything else but those two pieces going from the gas feed tube. I put it all back together and I'm back in business. Now if you do this and it still doesn't work, buy a new thermocouple. They're cheap. Somewhere between six and ten bucks last I looked, Honeywell makes them and they fit most gas units besides Glo-Warm. Have a nice Day. Cadge

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this type of heater is very sensitive to the state of the pilot since it uses a Renni type thermocouple to sense a low oxygen situation. Usually the pilot needs to be cleaned. If that does not restore operation only other thing to do is try replacing the thermocouple.
A low pilot will usually hold for a few minutes so I would expect that you have a bad thermocouple.

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