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I, have a williams forsaire direct vent wall heater pilot lights, main burner will not fire up? what is wrong?

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Replace the thermal couple

Posted on Sep 05, 2010

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The thermocouple is not working correctly. sometimes you can clean the soot build up from it and it will work again. sometimes they just need replacing. the thermocouple is what the pilot light flame heats up when you turn on the heater. when the thermocouple gets hot it sends a 20 to 60 millivolt signal to the gas valve to activate the gas flow to the main burner.

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If the fan coming on blows out the pilot light it is a pretty good indication that the heat exchanger is cracked. You should not continue to use the heater. I recommend contacting a qualified service technician to check it out and confirm that it is a cracked heat exchanger. Hope this helps

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I have a williams heater 3508732 and the pilot keeps shutting off


I need to replace a furnace (Williams 3508732 Forsaire T-vent Type)
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Williams 3003622 Wall Mounted 30,000 BTU The pilot light goes out when the main flame shuts down. The pilot light will stay lit for days when heat is not called for but when heat is called for the furnace...


I'm having the same exact problem... At first we thought was the vent... but the way the flames goes out... it seems that there is "not enough oxygen" more than "blown out by the wind"... right after both main & pilot goes out, I can't even light any external flame inside the chamber... and it doesn't feel like the outside cold air coming in... it just feel like there is some sort of gas in the chamber that's so strong, it prevents flame... and the only thing I can think of is that it doesn't have enough oxygen, but too much natural gas, and flame can't sustain.

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I have Wiiliams direct vent wall furnace. I smell gas only when pilot is on and burner is not on. It does not smell when it is fully running (burner is on)


Dear Alex191: I am shocked and amazed that the Williams heater company is STILL knowingly and willingly selling faulty direct vent gas heaters. My problems took place in 1988! I bought a 30,000 BTU Williams DIRECT VENT from The Home Depot. I took the time to remove window sashes and run gas line to the Williams heater that I had placed in the window aperture. I was glad to finally have heat and be able to heat the area of the house where I stayed. Then I began to smell gas when the Williams was OFF. I traced it to the area where the pilot light gas tubing entered the combustion chamber. I removed the Williams unit and replaced it with an identical make and model and the SAME THING HAPPENED!!! I sat on my bed and almost cried. I had the gas company come out and they labled the problem as a "fuzz leak". The warranty repairman came out and had no idea what to do. Tightening the retaining nut did nothing. I called Williams and even back then they said that they were aware of the problem. They called me back and wanted to send me a part and asked me, "Can you work on it?" I returned the Williams and bought a Perfection-Schwank CONSOL heater that burns the air in the room and vents horizontally to a 4 inch vertical gas vent and was very satisfied with it. When they went out of business I bought an "Empire" brand gas heater. I don't know if I'll ever buy another direct vent heater from anyone. I will be glad to write an affidavit should you decide to suit the Williams company.

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i had this problem a couple years ago and I had to scape where the flame lights and reset at the fuse box and it worked good luck

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The blower is heat activated, it takes more than the pilot. If the burners are on, verify power to the unit.

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Williams Forsaire wall furnace won't light


Replaced the thermocouple, works like a charm.

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