Immergas · A niche brand in the UK. 65 codes across 1 product family, each taken from the manufacturer’s manuals. Immergas technical support ↗
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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? |
|---|---|---|---|
| C7 | Temperature of transducer (inverter) module too high | Not stated | Yes |
| E0 | Water flow fault (after E8 has been displayed 3 times) | Not stated | Yes |
| E1 | Phase loss, or neutral/live connected inversely (three-phase units only) | Not stated | Yes |
| E2 | Communication fault between the control panel and the hydraulic module | Not stated | Yes |
| E3 | Fault of final outlet water temperature sensor (T1) | Not stated | Yes |
| E4 | Fault of DHW storage tank temperature sensor (T5) | Not stated | Yes |
| E5 | Error of refrigerant temperature sensor exiting the condenser (T3) | Not stated | Yes |
| E6 | Error of room (outdoor ambient) temperature sensor (T4) | Not stated | Yes |
| E7 | Fault of buffer tank temperature sensor (Tbt1) | Not stated | Yes |
| E8 | Water flow fault | Not stated | Yes |
| E9 | Error of compressor intake (suction) temperature sensor (Th) | Not stated | Yes |
| EA | Error of compressor discharge ('drain') temperature sensor (Tp) | Not stated | Yes |
| Eb | Error of solar panel temperature sensor (Tsolar) | Not stated | Yes |
| EC | Error of low temperature sensor (Tbt2) of the thermostat manifold/buffer | Not stated | Yes |
| Ed | Error of plate heat exchanger inlet water temperature sensor (Tw_in) | Not stated | Yes |
| EE | EEPROM fault of the hydraulic module main control board | Not stated | Yes |
| EP | Leakage fault on tank booster heater (TBH) | Not stated | Yes |
| F1 | Low voltage protection on DC bus | Not stated | Yes |
| H0 | Communication fault between hydraulic module main board and main control board PCB B | Not stated | Yes |
| H1 | Communication error between inverter module PCB A and main control board PCB B | Not stated | Yes |
| H2 | Fault of refrigerant outlet temperature sensor (T2) of plate heat exchanger (liquid pipe) | Not stated | Yes |
| H3 | Fault of refrigerant outlet temperature sensor (T2B) of plate heat exchanger (gas pipe) | Not stated | Yes |
| H4 | Protection for three times P6 (L0/L1) in an hour | Not stated | Yes |
| H5 | Fault of room temperature sensor (Ta) in the control panel | Not stated | Yes |
| H6 | Fault of fan motor | Not stated | Yes |
| H7 | Main circuit voltage protection fault | Not stated | Yes |
| H8 | Fault of pressure sensor | Not stated | Yes |
| H9 | Fault of zone 2 water temperature sensor (Tw2) | Not stated | Yes |
| HA | Fault of outlet water temperature sensor (Tw_out) | Not stated | Yes |
| Hb | Protection 'PP' three times and Tw_out < 7C | Not stated | Yes |
| Hd | Communication fault between hydraulic modules in parallel (cascade) | Not stated | Yes |
| HE | Communication error between main board and thermostat transfer board | Not stated | Yes |
| HF | EEPROM fault of the inverter module board | Not stated | Yes |
| HH | H6 appeared 10 times in 2 hours | Not stated | Yes |
| HP | Low pressure protection in cooling (Pe < 0.6) occurred 3 times in one hour | Not stated | Yes |
| L0 | Compressor inverter module fault | Not stated | Yes |
| L1 | Low voltage protection on DC bus | Not stated | Yes |
| L2 | High voltage protection on DC bus | Not stated | Yes |
| L4 | MCE operation anomaly | Not stated | Yes |
| L5 | Zero speed protection | Not stated | Yes |
| L7 | Phase sequence fault (three-phase models only) | Not stated | Yes |
| L8 | Compressor frequency variation higher than 15 Hz within 1 second | Not stated | Yes |
| L9 | Actual compressor frequency differs from target by over 15 Hz | Not stated | Yes |
| P0 | Low pressure protection switch | Not stated | Yes |
| P1 | High pressure protection switch | Not stated | Yes |
| P3 | Protection against compressor overcurrent | Not stated | Yes |
| P4 | Compressor discharge ('flow') temperature too high protection | Not stated | Yes |
| P5 | High temperature difference between water inlet and outlet of plate heat exchanger (Tw_out - Tw_in) | Not stated | Yes |
| P6 | Inverter module protection | Not stated | Yes |
| P9 | Fan protection | Not stated | Yes |
| Pb | Antifreeze protection | Partly | Yes |
| Pd | High temperature protection of refrigerant outlet temperature in the condenser | Not stated | Yes |
| PP | Inlet water temperature higher than outlet in heating mode (Tw_in > Tw_out) | Not stated | Yes |
| PUMP-E04 | Circulation pump LED code: Grid undervoltage | Yes | Yes |
| PUMP-E05 | Circulation pump LED code: Grid overvoltage | Yes | Yes |
| PUMP-E07 | Circulation pump LED code: Generator operation (warning) | Partly | Yes |
| PUMP-E09 | Circulation pump LED code: Turbine operation | Yes | Yes |
| PUMP-E10 | Circulation pump LED code: Block | Yes | Yes |
| PUMP-E11 | Circulation pump LED code: Dry operation (warning) | Partly | Yes |
| PUMP-E21 | Circulation pump LED code: Overload | Yes | Yes |
| PUMP-E23 | Circulation pump LED code: Short-circuit | Yes | Yes |
| PUMP-E25 | Circulation pump LED code: Contact/winding | Yes | Yes |
| PUMP-E30 | Circulation pump LED code: Module overheated | Yes | Yes |
| PUMP-E31 | Circulation pump LED code: Power section overheated | Yes | Yes |
| PUMP-E36 | Circulation pump LED code: Electronic failures | Yes | Yes |