Mitsubishi Electric AC / Heat Pump Error Codes & Fixes
Mitsubishi Electric Air Conditioner / Heat Pump: 5 error codes with meaning, severity, likely causes and repair cost estimates.
5Codes
2.8Average severity
20%High or critical
40%DIY-friendly
Severity distribution
Most viewed
E6
Mitsubishi Electric · Air Conditioner / Heat Pump
The indoor unit isn't getting valid signals back from the outdoor unit over the S3 wire.
Moderate
P8
Mitsubishi Electric · Air Conditioner / Heat Pump
The indoor coil isn't getting colder (or warmer) than the room after the compressor starts, so…
Moderate
U6
Mitsubishi Electric · Air Conditioner / Heat Pump
The outdoor inverter saw too much compressor current and shut down to protect the power module.
High
P1
Mitsubishi Electric · Air Conditioner / Heat Pump
P1: the indoor unit's return-air thermistor reads open or shorted, so the unit can't tell room…
Low
P6
Mitsubishi Electric · Air Conditioner / Heat Pump
P6: the indoor coil got too cold in cooling or too hot in heating – almost always an airflow…
Low
All codes (3)
E6
Mitsubishi Electric · Air Conditioner / Heat Pump
The indoor unit isn't getting valid signals back from the outdoor unit over the S3 wire.
Moderate
P8
Mitsubishi Electric · Air Conditioner / Heat Pump
The indoor coil isn't getting colder (or warmer) than the room after the compressor starts, so…
Moderate
U6
Mitsubishi Electric · Air Conditioner / Heat Pump
The outdoor inverter saw too much compressor current and shut down to protect the power module.
High
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