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Old 01-13-2009, 12:54 PM   #1
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Williams Wall Furnace


My wall furnace will not light. The pilot stays lit, but the heater will not come on. I replaced the thermopile and it worked for a week or so, but now it will not come on unless I tap on the (valve?) thing. Then sometimes it might come on for a couple of minutes then go back out. The pilot stays on fine though. If I need to try another thermopile I will, but I hate to spend more money on that if I don't have too. They are a little pricey and I don't know if I could return it if that was not the problem. Please help as it is cold.


Last edited by ROBBYT3; 01-13-2009 at 01:05 PM.
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Old 01-13-2009, 04:35 PM   #2
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at the top of your furnace is another switch called a "spill switch" which will negate what happens with the bottom if the temperature of the exhaust exceeds the limits. More than likely you need to replace the spill switch and the thermopile was ok from the get go.

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Old 01-14-2009, 10:22 AM   #3
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Thank you for the info. What does this spill switch look like?
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Old 01-14-2009, 11:40 AM   #4
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The spill switch is located towards the top left of the heater. Pull the cover and it will be obvious to you.

Let's not get the cart before the horse here because the problem could be an obstruction in the venting pipe. Such as a birds nest, dead squirrel, etc. that is preventing the exhaust gas from going up the pipe and triggering the spill switch to shut the down so your house does not fill with carbon monoxide.

I've had Williams furnaces for years, but this part is tricky because the electricity that triggers these switches is very small, in millivolts, and my best suggestion is for you to call in a local heater service guy who knows how it all works.

The risk is too great not to in this case.

Chuck
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Old 01-14-2009, 12:40 PM   #5
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Thank you, I will check that out. I really appreciate your help on this.
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Old 02-06-2009, 01:38 PM   #6
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Hey yall. I thought I would let you know, I turned the furnace completely off. Pilot and everything completely off for 2 days. Then I re lit the pilot, turned up the thermostat and the heater came on and has been working perfect now for about 3 weeks. Knock on wood!
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Old 02-06-2009, 01:56 PM   #7
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Thanks much for the feedback. Nice to be warm in the wintertime.

Chuck

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