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Coleman Furnace Diagnostics
Some of us have Coleman furnaces. The gas company techs refer to these in disparaging terms, but we've had no trouble with ours so far - well, until this year.
Randomly, we wouldn't get heat. The fan would blow, but it would never fire off. Unfortunately, when we called someone to look at it, it worked perfectly.
That tech did look at a few things, but couldn't see anything wrong. He said it was silly to just start replacing things, but did show me that the unit has a diagnostic light on it. You can see the green LED in the upper right of the picture at left. That's behind a metal cover that comes off with one screw. That cover has warnings about electrical hazards and all that, but it also has the diagnostic codes: if that green light is blinking three times in a row, for example, that indicates that the "Combustion Air Switch Failed to Close". That's what was keeping my furnace from working.
If you feel comfortable removing that cover, you can see the light. Don't do this if you aren't used to working around electrical stuff!
It would have been easier if the diagnostic light were visible from outside, but knowing what the problem is does help. I could probably go buy the Combustion Air Switch myself, but I'm a klutz, so I'll hire someone to do it.
Need to contact us? Email tony@aplawrence.com
Comments:
Author: ForneyJohnson Wed Oct 28 19:03:12 2009Tony
Two years ago I had a problem with my colemen furnace where the heat and a/c would come on at the same time. The a/c would run, but hot air would come out of the vents. I found a web-site which specialized in Mobile home repairs and parts. http://mobilehomerepair.com This Company carries all the replacement parts for the Coleman furnaces in our homes. They will also help you troubleshoot your furnace problems. They walked me through the troubleshooting process via e-mail. As it turned out, I had a shorted thermostat cable. This probably happened at the factory when the house was built. I had to replace the cable and all was well. My air damper switch also went last fall and I ordered the replacement from mobilehomerepair. The flashing code light told me what the problem was. Hope this helps. forneyj@comcast.net
Author: TonyLawrence Wed Oct 28 19:08:34 2009
Thanks - that's good to know!
Author: TonyLawrence Thu Oct 29 15:49:39 2009
Peter from Oak Point told me that some people had called him worried about this - that it might be dangerous.
I agree: that's why I said that you shouldn't go near this if you aren't comfortable around mechanical and electrical devices. I'm not very "handy" myself - I paid Standish Oil to come do the actual repair. Obviously Forney Johnson (he left the comment above) feels capable of doing this kind of work and I'm sure that there are other people at Oak Point who do also.
Most of us would leave it for someone more expert.
Note: it was a Middleboro Gas Company service tech who showed me the diagnostic light.
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