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Old 10-27-2011, 08:47 PM   #1
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Narrowing Down My Furnace Problem


So. Since I tried testing for power in nearly every spot in my furnace, I still can't figure out whats bad. BUT.

If I hook up a 24v DC/AC power supply to the pos and neg to the gas valve and then hardwire the fan switch, it blows hot air like it should.

Now what could cause this? There's so many relays in here I don't know where else to look or what part needs to be replaced.

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Old 10-27-2011, 09:22 PM   #2
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Narrowing Down My Furnace Problem


you have a standing pilot with a copper capillary screwing into the gas valve from a thermocouple sensing the pilot flame..when you call for heat it just sits no main gas and the fan will run only after the heat builds up in the chamber as designed...

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Old 10-28-2011, 06:35 PM   #3
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So what does this mean? And if I leave the fan switch plugged in, how long will it take for it to heat up and turn the fan on?
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Old 10-28-2011, 07:29 PM   #4
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If your best idea involves hard wiring a gas valve you should probably cut off your gas and call a HVAC contractor. I'm all for sharing information, but you appear to be dangerous enough without it!
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Old 10-29-2011, 04:52 AM   #5
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You may have a safety that is open. And it may have opened to prevent your death. Please don't hard wire your gas valve.

Post brand and model number of your furnace. A pic may help also.
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Old 10-29-2011, 09:47 AM   #6
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It's a Coleman 7900 Series. It's in a mobile home.
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Old 10-29-2011, 09:53 AM   #7
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probably an open flame roll out switch. Check for continuity across all safeties.
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Old 10-29-2011, 09:56 AM   #8
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Quote:
Originally Posted by beenthere View Post
probably an open flame roll out switch. Check for continuity across all safeties.
Posting pictures in a minute.
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Old 10-29-2011, 10:18 AM   #9
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Sorry for the pic size. Came straight off my phone. Where do I locate this Rollout Switch?










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Old 10-29-2011, 01:31 PM   #10
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where is the Flame Rollout Switch on my furnace? I was actually told by a few different people that this sounds like the problem so I would really like to find it and test it. Found one for $9 online so I hope that's it.
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Old 10-29-2011, 02:06 PM   #11
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Follow the blue and white wires of the gas valve. One will go to either a flame roll out, or a centrifical swith on the inducer.

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