wiscoaster
Well-known member
I had an HVAC tech come out this last spring to give my AC its annual checkout. He told me it was fine, and that, BTW, he'd found a dead mouse and a mouse nest in the control box. OK. Fine. Later in the season, when I really needed it, the AC wouldn't start up despite getting a "run" signal from the thermostat. I opened it up, and lo and behold, there was the mouse nest, the mouse crap, and even the dead mouse. The HVAC tech hadn't even bothered to clean it out. The mouse nest and crap was gunking up the compressor's power relay, preventing the relay contacts from closing when the relay got power. I cleaned it all up, using a whole can of electronic contact cleaner, and after that the AC worked just fine all summer.