Kensa · An established brand in the UK. 49 codes across 10 product families, each taken from the manufacturer’s manuals. Kensa technical support ↗
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49 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| A1 | Freeze protection activated - low or no water flow on ground (cold) side. | Yes | Yes |
| A2 | Ground return temperature T6 below the Heating Mode anti-freeze limit (right-hand compressor, twin units only). | Partly | Yes |
| DHT1 | Discharge gas temperature T7 exceeds factory high limit. | Yes | Yes |
| DHT2 | Discharge gas temperature T8 exceeds factory high limit (twin only). | Partly | Yes |
| DHWER | Heat pump has run in DHW mode longer than the designated time. | No | Yes |
| DI5 | High pressure switch open circuit. | Yes | Yes |
| DI6 | High pressure switch open circuit (twin compressor only). | Partly | Yes |
| E1 | Loss of contact with a probe inside the heat pump. | Yes | Yes |
| E2 | Loss of contact with a probe inside the heat pump. | Yes | Yes |
| E3 | Loss of contact with a probe inside the heat pump. | Yes | Yes |
| E4 | Loss of contact with a probe; E4 could be loss of contact with the weather compensation sensor. | Yes | Yes |
| E5 | T5 temperature probe error (ground return). | Yes | Yes |
| E6 | T6 temperature probe error (ground return, twin). | Not stated | Yes |
| E7 | T7 temperature probe error (discharge pipe). | Yes | Yes |
| E8 | T8 temperature probe error (discharge pipe, twin). | Not stated | Yes |
| E9 | T9 temperature probe error (weather compensation / outdoor sensor). | Not stated | Yes |
| FGC1 | Cooling-mode ground differential T5-T4 greater than set point. | No | Yes |
| FGC2 | Cooling-mode ground differential T6-T4 greater than set point (twin only). | No | Yes |
| FGH1 | Heating-mode ground temperature differential T4-T5 greater than set point. | No | Yes |
| FGH2 | Heating-mode ground temperature differential T4-T6 greater than set point (twin only). | No | Yes |
| FLC1 | Cooling-mode load differential T1-T2 greater than low-flow differential (cooling applications). | No | Yes |
| FLC2 | Cooling-mode load differential T1-T3 greater than low-flow differential (cooling, twin only). | No | Yes |
| FLH1 | Heating-mode load temperature differential T2-T1 greater than the low-flow differential. | No | Yes |
| FLH2 | Heating-mode load temperature differential T3-T1 greater than low-flow differential (twin only). | No | Yes |
| HCE | Simultaneous call for heating and cooling. | Yes | Yes |
| HGT1 | Ground return temperature T5 above the Cooling Mode upper limit. | Yes | Yes |
| HGT2 | Ground return temperature T6 above the Cooling Mode upper limit (twin only). | Partly | Yes |
| HP | Overheat warning - no or low flow around heating distribution circuit. | Yes | Yes |
| HP1 | High refrigerant pressure in discharge gas pipe (P5). | Yes | Yes |
| HP2 | High refrigerant pressure in discharge gas pipe (P6), twin compressor only. | Partly | Yes |
| HTPG | Ground side pressure P2 exceeds the high-pressure limit. | Yes | Yes |
| HTPL | Load (distribution) side pressure P1 exceeds the high-pressure limit. | Yes | Yes |
| HV | Supply voltage above the high-voltage limit. | Yes | Yes |
| LP | Low gas (refrigerant) pressure in machine; can occur with A1. | Yes | Yes |
| LP1 | Low refrigerant pressure in suction gas pipe (P3). | Yes | Yes |
| LP2 | Low refrigerant pressure in suction gas pipe (P4), twin only. | Partly | Yes |
| LPS1 | Refrigerant pressure too low (P3) - low-pressure safety. | Yes | Yes |
| LPS2 | Refrigerant pressure too low (P4), twin only - low-pressure safety. | Partly | Yes |
| LV | Supply voltage below the low-voltage limit. | Yes | Yes |
| S1 | P1 pressure sensor error (load side). | Yes | Yes |
| S2 | P2 pressure sensor error (ground side). | Yes | Yes |
| S3 | P3 pressure sensor error (suction pipe). | Yes | Yes |
| S4 | P4 pressure sensor error (suction pipe, twin). | Not stated | Yes |
| S5 | P5 pressure sensor error (discharge pipe). | Yes | Yes |
| S6 | P6 pressure sensor error (discharge pipe, twin). | Not stated | Yes |
| SSFC | Soft start fault. | Yes | Yes |
| tP | Low water pressure in the ground or heating system side (pipe relaxation or other pressure loss). | Yes | Yes |
| TPG | Ground side pressure P2 below the low-pressure ground-side limit. | Yes | Yes |
| TPL | Load (heating distribution) side water pressure P1 below the low-pressure limit. | Yes | Yes |