Preformed a winter maintenance on a mini split system. I arrived at the job and started at the outdoor unit, I started by vacuuming the unit down, I the checked the electrical wires and connections, I checked the amps on the compressor, I cleaned the coils, I checked behind the disconnect, I then went to the indoor unit and checked the filters, I took them outside to clean them, I vacuumed out the filters and the indoor unit, I went back outside vacuumed the drain line and put the unit back together, I finished by washing the unit down with water.