Preformed a winter maintenance on a Trane heat pump. Indoor unit: I checked amps on blower motor and heat, I checked wire connections, I checked Uv light, I checked the coils, I checked the drain pans and drain line, I cleaned the p-trap with a brush, I checked the float switch, I checked the surrounding ductwork. Outdoor unit: I checked amps on compressor and fan motor, I checked capacitor, I checked around the contactors and the board, I looked into the unit for rubbed wires, I checked around the reversing valve, I vacuumed the drain line, I washed the unit down with water.