The following is a list of Mitsubishi Air Conditioning error codes. P1 Intake sensor error P2 P9 Pipe (Liquid or 2-phase pipe) sensor error E6 E7 Indoor/outdoor unit communication error P4 Drain sensor error P5 Drain pump error PA Forced compressor error P6 Freezing/Overheating safeguard operation EE Communication error between indoor and outdoor units P8 […]