I came home the other day to find my a/c had shut off even though the thermostat was still set. Neither the outdoor unit or indoor one will turn on at all. Heat & A/C both provided by this machine but none of them will turn on. I've tried reseting circuit breakers, replacing filter, and checking the thermostat but still can't get it to turn on. The capacitor looks fine (a bit rusty, but not oily). It uses a luxpro PSDH121 model thermostat, and I'm quite sure that works. Anyone have any other ideas? I'd like to fix it myself if possible.