22 Mitsubishi generator fault/alarm codes with symptom, cause and remedy — compiled from Mitsubishi service and controller documentation.
| Code | Meaning / symptom | Cause | Remedy |
|---|---|---|---|
| 1-5 | Engine Overheats | Conduct cooling operation before stopping engine | |
| 1-6 | Engine Stops Due to Abnormality | Check and correct the cause of the problem before restarting | |
| 1-7 | Oil Pressure Drops | Stop engine immediately and inspect the lubricating system including the oil level and pump | |
| 1-8 | V-belt Breaks | Stop engine immediately | |
| 400970 | A\ÊuTion | ||
| A | A | ||
| ASP | Alarms and shutdown process | ||
| B17 | Pre-cleaner | ||
| D | D | ||
| FPL | Full performance level | ||
| GAIN | GAIN | ||
| I | I | ||
| L3 | Circulation water temperature overheat protection | ||
| L4 | DHW tank water temperature overheat protection | ||
| L5 | Indoor unit temperature thermistor (THW1, THW2, THW5A, THW5B, THW6, THW7, THW8, THW9) failure | ||
| L6 | Circulation water freeze protection | ||
| L8 | Heating operation error | ||
| L9 | Low primary circuit flow rate detected by flow sensor or flow switch (flow switches 1, 2, 3) | ||
| LA | Pressure sensor failure | ||
| LB | High pressure protection | ||
| LC | Boiler circulation water temperature overheat protection | ||
| d | Excessive blowby through breather due to worn cylinder liners, pistons, etc. |
Compiled from Mitsubishi service manuals and controller documentation. Cause/remedy shown where extracted; always verify against the manual for your exact model.
Engine Overheats. Remedy: Conduct cooling operation before stopping engine.
Engine Stops Due to Abnormality. Remedy: Check and correct the cause of the problem before restarting.
Oil Pressure Drops. Remedy: Stop engine immediately and inspect the lubricating system including the oil level and pump.
V-belt Breaks. Remedy: Stop engine immediately.