Performed diagnostic and found the breaker for the outdoor unit had tripped due to a failed capacitor. I also found the return air filter was dirty and there was no water safety switch on the secondary drain line. I spoke with homeowner and he chose to have the outdoor capacitor replaced, install a water safety switch on the drain line, and replace the Aprilaire 210 filter. I completed the repairs and cycled power at the thermostat. The system is operational at completion of service.