Product troubleshooting
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Mitsubishi Electric MUZ-FS12NAH*** troubleshooting and error codes
These codes are matched from manufacturer documentation to this model's series or control platform. Keep checks visible and safe; do not open electrical, refrigerant, gas, combustion, or sealed equipment compartments.
Source-backed code set
15 matched codes
| Code | Meaning | System area | Priority |
|---|---|---|---|
| 1 blink | Outdoor power-system abnormality | Outdoor power | Urgent |
| 2 blinks | Outdoor thermistor short or open circuit | Outdoor sensors | Service |
| 3 blinks | Outdoor control-system nonvolatile-memory failure | Outdoor control | Service |
| 6 blinks | Indoor-outdoor serial-signal failure | Communication | Service |
| 11 blinks | Stop valve or closed-valve condition | Refrigerant circuit | Urgent |
| 16 blinks | Four-way valve or pipe-temperature abnormality | Reversing valve | Urgent |
| 17 blinks | Outdoor refrigerant-system abnormality | Refrigerant circuit | Urgent |
| 2 blinks / restart | Overcurrent protection | Compressor power | Urgent |
| 3 blinks / restart | Discharge-temperature overheat protection | Compressor discharge | Urgent |
| 4 blinks / restart | Fin or control-board temperature overheat protection | Outdoor control | Urgent |
| 5 blinks / restart | High-pressure protection | Refrigerant pressure | Urgent |
| 8 blinks / restart | Compressor synchronous abnormality | Compressor | Urgent |
| 10 blinks / restart | Outdoor fan motor failure | Outdoor fan | Service |
| 12 blinks / restart | Compressor phase-current detection failure | Compressor power | Urgent |
| 13 blinks / restart | Inverter DC bus-bar voltage detection failure | Inverter power | Urgent |
No matching error codes found.