ELCO · A niche brand in the UK. 110 codes across 2 product families, each taken from the manufacturer’s manuals. ELCO technical support ↗
Filter by product family
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.
110 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| 1E0 | EEPROM error - main board | Yes | Yes |
| 1E5 | Condenser temperature probe T3A fault | Yes | Yes |
| 1Eb | Antifreeze probe Taf1 fault | Yes | Yes |
| 1Ed | Compressor discharge temperature probe A fault | Yes | Yes |
| 1EE | Refrigerant temperature probe T6A fault | Yes | Yes |
| 1F0 | IPM module transmission error (A) | Yes | Yes |
| 1F3 | Fan A transmission error | Yes | Yes |
| 1F4 | Protection L0 or L1 intervened 3 times in 60 minutes (circuit A) | Yes | Yes |
| 1F6 | Circuit A bus voltage (PTC) | Yes | Yes |
| 1F9 | Radiator (heat sink) temperature sensor Tfin1 fault | Yes | Yes |
| 1FF | Fan A fault | Yes | Yes |
| 1H9 | Compressor driver A - configuration error | Yes | Yes |
| 1HE | Expansion valve A error | Yes | Yes |
| 1PP | IPM module error, circuit A | Yes | Yes |
| 1PU | Fan A module error | Yes | Yes |
| 2E0 | EEPROM error - inverter A module | Yes | Yes |
| 2E5 | Condenser temperature probe T3B fault | Yes | Yes |
| 2Eb | Antifreeze probe Taf2 fault | Yes | Yes |
| 2Ed | Compressor discharge temperature probe B fault | Yes | Yes |
| 2EE | Refrigerant temperature probe T6B fault | Yes | Yes |
| 2F0 | IPM module transmission error (B) | Yes | Yes |
| 2F3 | Fan B transmission error | Yes | Yes |
| 2F4 | Protection L0 or L1 intervened 3 times in 60 minutes (circuit B) | Yes | Yes |
| 2F6 | Circuit B bus voltage (PTC) | Yes | Yes |
| 2F9 | Radiator (heat sink) temperature sensor Tfin2 fault | Yes | Yes |
| 2FF | Fan B fault | Yes | Yes |
| 2H9 | Compressor driver B - configuration error | Yes | Yes |
| 2HE | Expansion valve B error | Yes | Yes |
| 2P2 | Thermal cleanse (anti-legionella) not complete | No | Yes |
| 2P3 | DHW boost: comfort setpoint not reached | No | Yes |
| 2P4 | First thermostat of resistance (auto) tripped | No | Yes |
| 2P5 | Second thermostat of resistance (manual) tripped | No | Yes |
| 2P6 | Night tariff contact not present | No | Yes |
| 2P7 | Precirculation error | Yes | Yes |
| 2P8 | HP temperature out of range | No | Yes |
| 2PP | IPM module error, circuit B | Yes | Yes |
| 2PU | Fan B module error | Yes | Yes |
| 3E0 | EEPROM error - inverter B module | Yes | Yes |
| 3F3 | Fan C transmission error | Yes | Yes |
| 3FF | Fan C fault | Yes | Yes |
| 3HE | Expansion valve C error | Yes | Yes |
| 3PU | Fan C module error | Yes | Yes |
| 114 | Outdoor sensor damaged | Yes | Yes |
| 420 | Bus supply overload | Yes | Yes |
| 701 | Zone 1 flow (send) probe damaged | Yes | Yes |
| 702 | Zone 2 flow probe damaged | Yes | Yes |
| 703 | Zone 3 flow probe damaged (N/A) | Yes | Yes |
| 711 | Zone 1 return probe damaged | Yes | Yes |
| 712 | Zone 2 return probe damaged | Yes | Yes |
| 713 | Zone 3 return probe damaged (N/A) | Yes | Yes |
| 722 | Zone 2 overheat | Yes | Yes |
| 723 | Zone 3 overheat (N/A) | Yes | Yes |
| 902 | System flow sensor damaged | Yes | Yes |
| 903 | System return sensor damaged | Yes | Yes |
| 910 | HP communication error (RS 485) | Yes | Yes |
| 923 | Heating circuit pressure error | Yes | Yes |
| 924 | Communication error (e-BUS 2) | Yes | Yes |
| 933 | Overheat (>90 °C) | Yes | Yes |
| 934 | DHW tank sensor damaged | Yes | Yes |
| 935 | Tank overtemperature (>85 °C) | Yes | Yes |
| 936 | Floor thermostat 1 error (ST1) | Yes | Yes |
| 937 | No circulation error | Yes | Yes |
| 938 | Anode fault | No | Yes |
| 939 | HP (heat pump) error | Yes | Yes |
| 940 | Hydraulic scheme not defined | Yes | Yes |
| 941 | Night tariff contact not defined | Yes | Yes |
| 942 | Load shedding contact not defined | Yes | Yes |
| C7 | PL (module high temperature) occurred 3 times | Yes | Yes |
| d0 | Gate error (d0 and address displayed alternately every 10 s) | Yes | Yes |
| dF | Defrosting | No | No |
| E1 | Phase sequence - control from main board | Yes | Yes |
| E2 | Communication error between main board and keypad | Yes | Yes |
| E3 | Total outlet water temperature probe Tw fault (master unit only) | Yes | Yes |
| E4 | Outlet water temperature probe Two fault | Yes | Yes |
| E6 | Storage (DHW) temperature probe T5 fault | Yes | Yes |
| E7 | Room (outdoor air) temperature probe T4 fault | Yes | Yes |
| E8 | Phase sequence protection | Yes | Yes |
| E9 | No water flow (manual reset) - drained system | Yes | Yes |
| EC | Slave unit module reduction (communication) | Yes | Yes |
| EF | Return water temperature probe fault | Yes | Yes |
| EH | Autotest error | Yes | Yes |
| EP | Discharge temperature probe fault | Yes | Yes |
| EU | Condenser total temperature probe Tz fault | Yes | Yes |
| F2 | Insufficient superheat (overheating) | Yes | Yes |
| Fb | Pressure sensor fault | Yes | Yes |
| Fd | Return (suction) air temperature sensor fault | Yes | Yes |
| FE | Recovery temperature sensor fault | Yes | Yes |
| FP | DIP switch for modular unit configuration error | Yes | Yes |
| H5 | High / low voltage | Yes | Yes |
| L0 | Inverter module protection | Yes | Yes |
| L1 | Low voltage protection | Yes | Yes |
| L2 | High voltage protection | Yes | Yes |
| L4 | MCE error (inverter drive) | Yes | Yes |
| L5 | Speed 0 (compressor zero speed) | Yes | Yes |
| L7 | No phase (compressor phase loss) | Yes | Yes |
| L8 | Frequency variation higher than 15 Hz | Yes | Yes |
| L9 | Phase frequency difference higher than 15 Hz | Yes | Yes |
| P0 | High pressure / discharge temperature protection | Yes | Yes |
| P1 | Low pressure protection | Yes | Yes |
| P2 | Total condenser output high temperature Tz | Yes | Yes |
| P4 | Compressor A in protection (current) | Yes | Yes |
| P6 | Module error | Yes | Yes |
| P7 | Condenser high temperature | Yes | Yes |
| P9 | Inlet/outlet water temperature difference | Yes | Yes |
| Pb | Winter antifreeze protection | No | No |
| PC | Evaporator low pressure in cooling | Yes | Yes |
| PE | Antifreeze protection - evaporator low temperature in cooling | Yes | Yes |
| PF | Circuit board lock - controller lock/unlock error | Yes | Yes |
| PH | High room (outdoor air) temperature T4 | No | Yes |
| PL | Tfin module high temperature | Yes | Yes |