Upon my arrival today, the customer greeted me at the door. He then allowed me to come inside and he showed me around all the equipment. He showed me the thermostat ,filters, the indoor unit and the outdoor unit. I asked him what was going on with the system and then he informed me that the breaker on the indoor unit kept tripping. He showed me the breaker. It was a 60amp breaker. So I went ahead and get started with the check. During my inspection I found that the breaker was not tripping automatically. I asked the customer if it took a while for the breaker to trip and he did inform me yes. While checking the outdoor unit, I noticed that the thermostat was not programmed correctly. The customer had installed his own thermostat, thinking that it was that, that was causing the issue. The thermostat was programmed for a conventional AC and furnace. I did give him the option to reprogram it correctly and he did go with this option. After the thermostat was reprogrammed, I was able to ch