Heating Repair: Arrived at the client’s home after they reported that the furnace fan continued running even when the system was not calling for heat. Inspected the control board, thermostat settings, and fan relay. Found a stuck fan relay on the control board that was keeping the blower motor energized at all times. Replaced the faulty relay, reset the system, and tested operation. Confirmed that the fan now cycles on and off correctly with heating demand.