TCL · A niche brand in the UK. 65 codes across 1 product family, each taken from the manufacturer’s manuals.
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Type the code on your display or a word from its meaning. Each code opens its own page with what it means, whether it is safe and what you can check.
65 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| C1 | Multiple master control failure (more than one master wired controller) | Not stated | Yes |
| C7 | WiFi communication failure | Not stated | Yes |
| D1 | Abnormal outlet water temperature after auxiliary heating | Not stated | Yes |
| D2 | Abnormal temperature of plate heat exchange inlet water | Not stated | Yes |
| D3 | Abnormal temperature of plate heat exchange outlet water | Not stated | Yes |
| D4 | Plate heat exchanger refrigerant gas pipe (temperature) is abnormal | Not stated | Yes |
| D5 | Plate heat exchanger refrigerant liquid pipe (temperature) is abnormal | Not stated | Yes |
| D6 | Abnormal final outlet water temperature of the system | Not stated | Yes |
| D7 | Zone 1 inlet water temperature abnormal | Not stated | Yes |
| D8 | Zone 2 inlet water temperature abnormal | Not stated | Yes |
| D9 | Zone 3 inlet water temperature abnormal | Not stated | Yes |
| DA | Zone 1 room temperature abnormal | Not stated | Yes |
| DB | Zone 2 room temperature abnormal | Not stated | Yes |
| DC | Zone 3 room temperature abnormal | Not stated | Yes |
| dF | The inlet water temperature of the balance tank is abnormal | Not stated | Yes |
| dH | The outlet water temperature of the balance tank is abnormal | Not stated | Yes |
| dj | Solar temperature Tsolar sensor fault | Not stated | Yes |
| dn | Hot water tank temperature Thwt sensor fault | Not stated | Yes |
| E0 | Communication failure between indoor and outdoor unit | Not stated | Yes |
| E3 | Coil temperature sensor fault | Not stated | Yes |
| E4 | System maintenance data abnormal | Not stated | Yes |
| E5 | DIP (switch) abnormal | Not stated | Yes |
| E7 | Outdoor temperature sensor failure | Not stated | Yes |
| E8 | Exhaust temperature sensor failure | Not stated | Yes |
| EA | Outdoor current sensor failure | Not stated | Yes |
| Eb | Communication failure between indoor unit and wire controller | Not stated | Yes |
| EC | Communication failure between drive board and main PCB | Not stated | Yes |
| Ed | Indoor unit EE (EEPROM) error | Not stated | Yes |
| EE | Outdoor EEPROM failure | Not stated | Yes |
| EF | Outdoor DC fan failure | Not stated | Yes |
| EH | Malfunction of outdoor air intake sensor | Not stated | Yes |
| Ej | Communication failure between indoor unit and thermostat | Not stated | Yes |
| En | Module communication error | Not stated | Yes |
| F2 | Outdoor exhaust temperature sensor failure protection | Not stated | Yes |
| F3 | Outdoor coil temperature sensor failure protection | Not stated | Yes |
| F5 | PFC protection | Not stated | Yes |
| F6 | Compressor loss/reverse phase protection | Not stated | Yes |
| F7 | Module temperature protection | Not stated | Yes |
| F8 | 4-way valve reversing failure (heating mode) | Not stated | Yes |
| FA | Compressor phase current detection failure | Not stated | Yes |
| Fy | Lack of refrigerant | Not stated | Yes |
| H1 | High pressure switch protection | Not stated | Yes |
| H2 | Low pressure switch protection | Not stated | Yes |
| H3 | High pressure sensor failure | Not stated | Yes |
| L1 | Water temperature difference between plate heat exchanger inlet and outlet too large | Not stated | Yes |
| L2 | Water temperature difference between plate heat exchanger inlet and outlet abnormal | Not stated | Yes |
| L3 | Plate heat exchanger outlet water temperature too low | Not stated | Yes |
| L4 | Plate heat exchanger outlet water temperature too high | Not stated | Yes |
| L5 | Plate heat exchanger inlet water temperature too low | Not stated | Yes |
| L6 | Plate heat exchanger inlet water temperature too high | Not stated | Yes |
| L7 | Water side antifreeze | Not stated | Yes |
| L8 | Insufficient water flow fault | Not stated | Yes |
| Lb | Auxiliary electric heating feedback failure | Not stated | Yes |
| LC | Water tank electric heating feedback failure | Not stated | Yes |
| Ld | Emergency frequent defrosting | Not stated | Yes |
| LE | External water pump failure | Not stated | Yes |
| LP | Main water pump fault | Not stated | Yes |
| P0 | IPM module protection / compressor overcurrent / inverter module protection | Not stated | Yes |
| P1 | DC bus over/undervoltage, AC input undervoltage | Not stated | Yes |
| P2 | AC input overcurrent | Not stated | Yes |
| P4 | Exhaust temperature too high protection | Not stated | Yes |
| P5 | Refrigeration anti-overcooling failure | Not stated | Yes |
| P6 | Refrigeration overheating prevention failure | Not stated | Yes |
| P7 | Heating protection against overheating | Not stated | Yes |
| P8 | Outdoor ambient temperature too high/too low protection | Not stated | Yes |