Mini Split
Mitsubishi Electric Mini Split error codes
15 codes across 1 model family. Start with your model number, because Mitsubishi Electric reuses the same numbers for different faults on different boards.
Mitsubishi Electric shares code tables with other brands
Mitsubishi Electric splits its equipment across several unrelated control platforms, and the same lamp pattern means different things on each one, so the codes are published per model family rather than for the brand as a whole. The GL series is R410A.
Find your model family
The model number is on the data plate, usually on the side or back of the unit or behind the service panel. It usually starts with the letters or numbers in the name below.
MSZ and MSY indoor units with MUZ cooling only and MUY heating outdoor units on R410A. There is no numeric display: you count blinks of the upper operation indicator lamp on the indoor unit. The same blink count can mean an indoor fault or an outdoor one, and a three second steady hold before the blinking with no beep is what tells the two apart, with a second LED inside the outdoor unit narrowing several outdoor codes to one part.