[rohrmann]

Corrosion in the control box below the A/C unit is a problem, due to condensation. We had our front A/C unit fail several years ago, and upon inspection, I found corrosion all over the circuit board in the control box, in addition to the phone cable connectors. I replaced the box for a little over $100 at the time, and it has been working fine ever since. This is a photo of the corrosion on the circuit board.