I was called to a home to diagnose a problem with the air conditioning system. Upon arrival, I found that the system was not powering on. I checked the power source and found that the circuit breaker had tripped. I reset the breaker and tested the system again. This time, the system powered on and cooled the home. I checked the system for any other issues and found that the fan was not running. I replaced the fan and tested the system again. This time, the fan ran and the home cooled down. The customer was happy with the service and thanked me for my help.