I have an Source1 HVAC control which is failing. It works. turns on the heat, but shuts off prematurely. Does anyone know if it is possible to fix it, or is that too complicated to try fixing by replacing the heat damaged resistors and diodes? see front at
BTW, this image was scanned with a HP desk scanner
Is there anyway to set the scanner so as to set the focal length 1 inch farther out? I was thinking of removing the glass cover and hope the head don't touch the board!
Hi!
That looks similar to a controller I've seen in a Comfortmaker furnace. The controller in that application was known as "The General
90" and was also made in Mexico. Although it had fewer components on it, the connectors were very similar and in about the same positions.It's mentioned on that particular controller that no service is possible, so don't expect any help from the manufacturer. They'll probably try to sell you another one.
What I'd look at are any and all capacitors, to see if any have failed. If the module is mounted on the furnace blower, it should have very good cooling, so heat related failures are unlikely as long as the blower is running. :-) But if it's not in the path of some airflow, or if it's near a burner, the capacitors are a likely candidate for problems. They won't stand the heat, as the electrolyte dries up and makes the capacitor fail. If you do not have a capacitor checker, look for bulged tops or brown flaky residue on the capacitor tops.
If that doesn't turn anything up, the glue that seems to be all over that board should be investigated. Some of it may have turned conductive over time. This will produce strange results.
Finally, examine the relays. See if you can pop them open without undue violence. You may find burned contacts that don't do what they are supposed to do reliably. Fixing this may be a little difficult-- usually some gentle abrasion of the contacts to clean the burnt material away will work, but eventually you will need a new relay as the damage will eventually return. If the manufacturer of the relays is still making them, and they are not a custom part, you may be able to get them.
William
Hi!
Probably not easily or at all. I believe you'd have to change the scanner's optics considerably to pull this off. Do you have a digital camera?
If you do, it should do an acceptable job of photographing the board and its components. Any macro mode that is available can be used for close ups.
William
Flatbed scanner for circuit board? Neat! I didn't see any really bad solder connections. A friend of mine is a computer repairman. I've done a bunch of circuit board solder, but that was decades ago. I'm sure I've still got the touch. You may have a computer guy near you who can look it over.
At the moment, I'll agree with my esteemed colleague, Steve. And suggest you call a furnace tech. Sounds like the board isn't the problem.
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If anything is failing on those boards, it's most likely one of those relays. Hard to say for sure with pic out of focus like that, but sure looks like there's a few areas of dismally bad original solder, too.
Does anyone know how to clean it out see a pic
Yes, looks pretty routine to me. A basic clean and check.
-- Christopher A. Young Learn more about Jesus
The problem was that I mounted the fan backwards.
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