Furnace Problem

[JRJ]

The other morning we woke up to the smell of electrical burning. Turned out to be the forced air unit in the attic. There was about a 1 1/2" hole burned in the control circuit board and some of the attached wiring was melted. The breaker for the furnace was thrown or it could have been bad.

After a new circuit board and R&R the harness, it works fine. The repair guy doesn't seem to know why? Says it might have been the AC that caused the problem. After running the heater, we switched over to AC and it ran fine without a problem.

Any ideas as to what may have caused the circuit board meltdown? I'm wondering if there is a root problem that hasn't been addressed.

 

[lncoop]

Re: Furnace Problem

Just happens some times. Dust in the wrong place, disruption in the cosmos, etc. I wouldn't worry too much about it unless it's a recurring problem. The good news is the breaker tripped.

 

[JRJ]

Re: Furnace Problem

Thanks for the reply Incoop. So far, so good.

 

[Tim Frank]

Re: Furnace Problem

Had what sounds like the exact same situation with a rooftop unit at a sports facility.
The only additional clue in my case was the presence of two small and very charred rodents.
Mus Musculus at work.

 

[lncoop]

Re: Furnace Problem

That'll do it too. Did you make some sauce to go with the BBQed rodents?

 

[j_martin]

Re: Furnace Problem

Had what sounds like the exact same situation with a rooftop unit at a sports facility.
The only additional clue in my case was the presence of two small and very charred rodents.
Mus Musculus at work.

That's why it is uber important to put the place holder cover back in a computer when you pull out an expansion card. Mice like the nice warm place, and they are in the habit of wetting their bed. It's pretty hard on electronics.

 

[Tim Frank]

Re: Furnace Problem

Thanks...never thought of that one.

 

[jlinder]

Re: Furnace Problem

Wonder if you could have had a lightening strike. I just went through that and lost not only the circuit board but the gas valve.
You can read about what I had by looking at the thread furnace problems ( http://forums.iboats.com/showthread.php?t=445584 ). I had a lot of help from people here and I posted a picture of what the lightening did to my circuit board.