York (Johnson Controls) · A niche brand in the UK. 49 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.
49 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| bA | T4 sensor out of operation range | Not stated | Yes |
| C7 | High temperature protection of inverter module | Not stated | Yes |
| E0 | Water flow malfunction (after 3 times E8) | Not stated | Yes |
| E1 | Phase loss or neutral wire and live wire are connected reversely | Not stated | Yes |
| E2 | Communication malfunction between controller and hydraulic module | Not stated | Yes |
| E3 | Total outlet water temp. sensor (T1) malfunction | Not stated | Yes |
| E4 | Water tank temp. sensor (T5) malfunction | Not stated | Yes |
| E5 | Air side heat exchanger temperature sensor (T3) malfunction | Not stated | Yes |
| E6 | The ambient temperature sensor (T4) malfunction | Not stated | Yes |
| E7 | Buffer tank upper temp. sensor (Tbt) malfunction | Not stated | Yes |
| E8 | Water flow malfunction | Not stated | Yes |
| E9 | Suction temperature sensor (Th) malfunction | Not stated | Yes |
| EA | Discharge temperature sensor (Tp) malfunction | Not stated | Yes |
| Eb | Solar temp. sensor (Tsolar) malfunction | Not stated | Yes |
| Ed | Inlet water temp. sensor (Tw_in) malfunction | Not stated | Yes |
| EE | Hydraulic module EEprom malfunction | Not stated | Yes |
| F1 | DC bus low voltage protection | Not stated | Yes |
| F6 | EXV1 fault | Not stated | Yes |
| H0 | Communication malfunction between main control board and hydraulic module board | Not stated | Yes |
| H1 | Communication malfunction between main control board and inverter board | Not stated | Yes |
| H2 | Liquid refrigerant temp. sensor (T2) malfunction | Not stated | Yes |
| H3 | Gas refrigerant temp. sensor (T2B) malfunction | Not stated | Yes |
| H4 | Three times L0 protection | Not stated | Yes |
| H5 | Room temp. sensor (Ta) malfunction | Not stated | Yes |
| H6 | The DC fan malfunction | Not stated | Yes |
| H7 | Voltage protection | Not stated | Yes |
| H8 | Pressure sensor malfunction | Not stated | Yes |
| H9 | Outlet water for zone 2 temp. sensor (Tw2) malfunction | Not stated | Yes |
| HA | Outlet water temp. sensor (Tw_out) malfunction | Not stated | Yes |
| Hb | Three times PP protection and Tw_out below 7 C | Not stated | Yes |
| Hd | Communication malfunction between master unit and subordinate unit | Not stated | Yes |
| HF | Inverter module board EEprom malfunction | Not stated | Yes |
| HH | 10 times H6 in 2 hours | Not stated | Yes |
| HP | Low pressure protection in cooling mode | Not stated | Yes |
| L0 | Inverter or compressor protection | Not stated | Yes |
| L1 | DC bus low voltage protection | Not stated | Yes |
| L2 | DC bus high voltage protection | Not stated | Yes |
| L3 | Current sampling error of PFC circuit | Not stated | Yes |
| L4 | Rotating stall protection | Not stated | Yes |
| L5 | Zero speed protection | Not stated | Yes |
| L7 | Phase loss protection of compressor | Not stated | Yes |
| P0 | Low pressure switch protection | Not stated | Yes |
| P1 | High pressure switch protection | Not stated | Yes |
| P3 | Compressor overcurrent protection | Not stated | Yes |
| P4 | Compressor discharge temperature too high protection | Not stated | Yes |
| P5 | abs(Tw_out-Tw_in) value too big protection | Not stated | Yes |
| Pb | Anti-freeze mode | Not stated | Yes |
| Pd | High temperature protection of air side heat exchanger temperature (T3) | Not stated | Yes |
| PP | abs(Tw_out-Tw_in) abnormal protection | Not stated | Yes |