Arrived to remedy an inoperable system. Upon inspection of the system found a code displayed saying that the fan is operating, despite the system doing nothing. Cycled power and the system was still displaying this code. Cycled power again and the system started operating. Determined that the control board thought that the fan was running and is not actually communicating with the fan motor. Once system started running heard a crackling noise coming from the voltage rectifier for the fan motor. Determined the system is in need of a control board and a voltage rectifier. Presented repairs to homeowner and with their approval reached out and ordered parts. Had a parts runner go get the necessary parts. Once parts arrived replaced the control board and voltage rectifier. Cleaned up the thermostat wires to prevent issues in the future. Tested system operations. System is functioning properly at this time.