Your Vario(TL) R454B Series system is equipped with an advanced self-diagnostic function. To help identify a potential issue, the system will display a specific "error code"—usually a combination of letters and numbers—on the indoor or outdoor unit.
This guide is designed to help you accurately interpret these codes. Please find your code in the table below to see its meaning and link to the correct solution.
This guide applies to the following Vario (TL) R454B Series models:
TL-9K1VB-19S-I+O
TL-9K2VB-20S-I+O
TL-12K1VB-21S-I+O
TL-12K2VB-23S-I+O
TL-18K2VB-21S-I+O
TL-24K2VB-21S-I+O
TL-36K2VB-19S-I+O
| Code | Reason |
| E0 | IDU & ODU Communication failure |
| E1 | IDU Room Temperature sensor failure. (IDU RT failure) |
| E2 | IDU Coil temperature sensor failure. (IDU IPT failure) |
| E3 | ODU Coil temperature sensor failure. (OPT) |
| E4 | AC Cooling system abnormal |
| E5 | IDU/ODU mismatched failure (specially performance test on the production line) |
| E6 | IDU PG Fan motor / DC fan motor works abnormal (IDU failure) |
| E7 | ODU Ambient Temperature sensor failure |
| E8 | ODU Discharge Temperature sensor failure. |
| E9 | IPM / Compressor driving control abnormal. |
| EA | ODU Current Test circuit failure |
| Eb | The Communication abnormal of Main PCB and Display board (IDU failure) |
| EC | ODU modules Communication failure |
| EE | ODU EEPROM failure. |
| EF | ODU DC fan motor failure. |
| EH | ODU suction temperature sensor failure |
| EP | ODU compressor casing top failure |
| EU | ODU Voltage test circuit abnormal. |
| Ej | ODU central coil temperature sensor failure. |
| En | ODU gas pipe temperature sensor failure. |
| Ey | ODU liquid pipe temperature sensor failure |
| P0 | IPM module protection. |
| P1 | Over / under voltage protection. |
| P2 | Over current protection. |
| P4 | ODU Discharge pipe Over temperature protection. |
| P5 | Sub-cooling protection on Cooling mode. |
| P6 | Overheating protection on Cooling mode. |
| P7 | Overheating protection on Heating mode. |
| P8 | Outdoor Over temperature/Under temperature protection. |
| P9 | Compressor driving protection (Load abnormal). |
| PA | Communication failure/mode conflict |
| F0 | Infrared Customer feeling test sensor failure. (IDU failure) |
| F1 | Electric Power test module failure. (IDU failure) |
| F2 | Discharge temperature sensor failure PROTECTION. |
| F3 | ODU coil temperature failure PROTECTION. |
| F4 | Cooling system gas flow abnormal PROTECTION. |
| F5 | PFC PROTECTION |
| F6 | The Compressor lack of phase / Anti-phase PROTECTION. |
| F7 | IPM Module temperature PROTECTION |
| F8 | 4-Way Value reversing abnormal. |
| F9 | The module temperature test circuit failure. |
| FA | The compressor Phase-current test circuit failure. |
| Fb | Limiting/Reducing frequency for Over load protection on Cooling/Heating mode. |
| FC | Limiting/Reducing frequency for High power consumption protection. |
| FE | Limiting/Reducing frequency for Module current protection (phase current of compressor). |
| FF | Limiting/Reducing frequency for Module temperature protection. |
| FH | Limiting/Reducing frequency for Compressor driving protection. |
| FP | Limiting/Reducing frequency for anti-condensation protection. |
| FU | Limiting/Reducing frequency for anti-frost protection. |
| Fy | Gas leakage protection |
| bf | TVOC sensor failure (IDU failure, optional) |
| bc | PM2.5 sensor failure (IDU failure, optional) |
| bj | Humidity sensor failure. (IDU failure) |
| Fd | The communication of the refrigerant sensor is abnormal |
| Hd | Refrigerant Leak Protection |
| d4 | Water full protect |
| d5 | Access control protection |
| H1 | High pressure switch malfunction |
| H2 | Low pressure switch malfunction |
| CL | Filter duty remind |
For detailed, step-by-step solutions for all the codes listed above, please view the complete troubleshooting guide.
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