HeatingCodesMitsubishi Electric MSZ-GX mini-split error codes
On the MSZ-GX series you can read the unit's error code from the remote controller while the left or upper operation-indicator lamp on the indoor unit is blinking. The manual tells you to stop using the air conditioner, turn off the breaker and contact your dealer when the unit has an error.
How to read the display
With the remote controller off, point it at the indoor unit and hold CHECK with a fine-tipped object. "00" is shown. Keep pointing until the indoor unit beeps.
When the display shows 00: two beeps means the unit has no error, and one beep means the unit has an error. Then press the up or down buttons to step through codes in order from 00 and E6 up to UP.
For each code, two beeps from the indoor unit means the unit has the error for the code shown. One beep means no error for that code, so keep stepping. No beep means the diagnosis failed, so try again.
Pressing other buttons cancels the error code display. If the remote is operated while the lamp is not blinking, the code shown might not be accurate.
Mitsubishi Electric code table
| Code | Meaning | What the document says |
|---|---|---|
| E6 / E7 | Indoor unit: serial signal | |
| EE | Indoor unit: inconsistency of the indoor unit and outdoor unit's refrigerant | |
| Fb | Indoor unit: indoor control system | |
| FH | Indoor unit: refrigerant sensor of the indoor unit | |
| FL | Indoor unit: refrigerant leakage abnormality of the indoor unit; abnormality related to the refrigerant sensors for the other indoor units when multiple indoor units are connected | |
| P1 | Indoor unit: room temperature thermistor | |
| P2 / P9 | Indoor unit: indoor coil thermistor | |
| P4 | Indoor unit: drain sensor | |
| Pb | Indoor unit: indoor fan motor | |
| E8 / E9 / EC | Outdoor unit: indoor/outdoor communication, receiving error | |
| FC | Outdoor unit: nonvolatile memory data | |
| Fd | Outdoor unit: different voltage | |
| P8 | Outdoor unit: 4-way valve / pipe temperature | |
| PL | Outdoor unit: outdoor refrigerant system | |
| U3 | Outdoor unit: discharge temperature thermistor | |
| U4 | Outdoor unit: defrost thermistor, fin temperature thermistor, P.C. board temperature thermistor, ambient temperature thermistor or outdoor heat exchanger temperature thermistor | |
| UE | Outdoor unit: stop valve (closed valve) | |
| UP | Outdoor unit: outdoor power system |
Source: Mitsubishi Electric MSZ-GX operation manual, error code table (page En-18). Rows are grouped as in the manual: indoor unit codes first, then outdoor unit codes. H6 does not appear in this table.
Sources
- MSZ-GX Operation Manual, "Error Code Display Mode" (A2L series, 2024) (Mitsubishi Electric) Covers: Mitsubishi Electric MSZ-GX / MUZ-GX A2L-series wall-mounted units. Other Mitsubishi lines (for example FH, GL, GE) can use different code sets and LED blink patterns; use the manual for your exact model.