Mitsubishi Electric fault codes

53 documented codes for Mitsubishi Electric mini-splits, each cited to the manufacturer's own manual. Mitsubishi Electric ductless systems use two different fault-code displays. Residential M-Series wall units (MSZ/MSY indoor with MUZ/MUY single-zone or MXZ multi-zone outdoor) that ship with only an infrared handheld remote report faults by blinking the OPERATION INDICATOR lamp on the indoor unit a set number of times - this is the 'blinking N times' pattern homeowners search for. The same A-Control platform, when a wired remote controller (PAR-series or MHK-series thermostat) is connected, displays the alphanumeric check codes (P1-PL, E0-EF, F3/F5, U1-UP) plus their 4-digit equivalents. P-Series / Mr. Slim equipment (PUZ outdoor, PKA/PLA/PEAD indoor) uses the same alphanumeric check-code set, so the code meanings below apply across M-Series and P-Series. Codes beginning with P and E are detected by the indoor unit; codes beginning with U and F are detected by the outdoor unit..