I live in an area whose local climate encourages corrosion. It is warm, humid, and near the ocean, though not near enough to get any salt-water spray.
Five years after building the house, the AC units are starting to quit, one by one. The outdoor condenser units have PC boards, which the repair guy says are “worn out”. He showed me small areas of slight discoloration on the boards. A yellowish tinge, which doesn’t look like copper corrosion (to me), and I’m surprised that it would affect electrical function. I’m getting a bit suspicious, since replacing the boards costs $250 a pop, and I’m reminded of the razor/blade and printer/ink business models. On the other hand, to be fair, replacing the boards does seem to fix the problem.
So, two questions:
- Is this a common problem with all AC units, or did I just get unlucky and buy ones that are especially susceptible to it?
- If this is a corrosion problem, is there some goop coating that I could apply that might prevent it?
Edit: To the people requesting photographs: I’m aware that these would be very helpful, but the guy took the boards away with him. Next time (I expect there will be a next time quite soon).