Product troubleshooting
TOSOT TM18D6MO 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
52 matched codes
| Code | Meaning | System area | Priority |
|---|---|---|---|
| C5 | Jumper cap malfunction | Indoor control configuration | Service |
| E6 | Indoor-outdoor communication malfunction | Communication | Service |
| H5 | IPM protection | Inverter power module | Urgent |
| L3 | Outdoor fan or DC motor malfunction | Outdoor fan | Service |
| LA | Outdoor fan or DC motor malfunction | Outdoor fan | Service |
| H3 | Compressor overload protection | Compressor protection | Urgent |
| F0 | Insufficient refrigerant or refrigerant cut-off protection | Refrigerant circuit | Urgent |
| F1 | Indoor ambient temperature sensor open or short circuit | Indoor ambient sensor | Service |
| F2 | Indoor evaporator temperature sensor open or short circuit | Indoor evaporator sensor | Service |
| H6 | No feedback from indoor unit motor | Indoor fan motor | Service |
| LP | Indoor and outdoor unit capacity mismatch | Equipment matching | Service |
| C4 | Outdoor-unit jumper cap malfunction | Outdoor control configuration | Service |
| b7 | Gas-valve temperature sensor open or short circuit | Gas-valve temperature sensor | Service |
| b5 | Liquid-valve temperature sensor open or short circuit | Liquid-valve temperature sensor | Service |
| E1 | System high-pressure protection | Refrigerant pressure | Urgent |
| E3 | System or compressor low-pressure protection | Refrigerant pressure | Urgent |
| E4 | Compressor high-discharge-temperature protection | Compressor discharge temperature | Urgent |
| E5 | AC overcurrent protection | Electrical current | Urgent |
| E7 | System mode conflict | Operating mode | Service |
| E8 | High-temperature prevention protection | Temperature protection | Urgent |
| EE | EEPROM malfunction | Outdoor control memory | Service |
| Fo | Refrigerant recovery mode | Service mode | Notice |
| F3 | Outdoor ambient temperature sensor open or short circuit | Outdoor ambient sensor | Service |
| F4 | Outdoor condenser temperature sensor open or short circuit | Outdoor condenser sensor | Service |
| F5 | Outdoor discharge temperature sensor open or short circuit | Outdoor discharge sensor | Service |
| FC | Microswitch malfunction | Sliding-door microswitch | Service |
| H4 | System abnormal | System protection | Urgent |
| H7 | Compressor desynchronization | Compressor drive | Urgent |
| HC | PFC protection | Power factor correction | Urgent |
| HE | Compressor demagnetization protection | Compressor | Urgent |
| JF | Indoor unit and inspection-board communication malfunction | Inspection-board communication | Service |
| L1 | Humidity sensor malfunction | Humidity sensor | Service |
| L9 | High-power protection | Power protection | Urgent |
| LC | Startup failed | Compressor startup | Urgent |
| Ld | Lost phase | Compressor power | Urgent |
| oE | Undefined outdoor-unit error | Outdoor unit | Service |
| P5 | Compressor over-phase-current protection | Compressor current | Urgent |
| P6 | Drive-board and main-board communication malfunction | Outdoor control communication | Service |
| P7 | Module temperature-sensor circuit malfunction | Module temperature sensor | Service |
| P8 | Module overheating protection | Inverter module temperature | Urgent |
| PF | Drive-board ambient temperature sensor malfunction | Drive-board ambient sensor | Service |
| PH | DC bus voltage too high | DC bus voltage | Urgent |
| PL | DC bus voltage too low | DC bus voltage | Urgent |
| PU | Capacitor charging malfunction | Inverter capacitor charging | Service |
| rF | RF module malfunction | RF module | Service |
| U1 | Phase-current detection circuit malfunction | Current detection circuit | Service |
| U2 | Compressor lost-phase protection | Compressor power | Urgent |
| U3 | DC bus voltage-drop malfunction | DC bus voltage | Urgent |
| U5 | Unit current-detection malfunction | Current detection | Service |
| U7 | Four-way valve abnormal | Reversing valve | Service |
| U8 | Indoor-unit zero-crossing signal malfunction | Indoor control power signal | Service |
| U9 | Outdoor-unit zero-crossing malfunction | Outdoor control power signal | Service |
No matching error codes found.