Preformed a winter maintenance on a Lennox heat pump. Indoor unit: I checked amps on blower motor and heat strips, I checked coils, I checked drain pan and drain line, I checked float switches, I checked Uv light, I checked surrounding ductwork, I checked wire connections. Outdoor unit: I checked amps on compressor and fan motor, I checked behind the board, I checked around the disconnect, I looked into the unit for rubbed wires, I vacuumed the drain line, I washed the unit down with water. Everything is working properly at this point in time.