ESP (Earth Save Products) · A niche brand in the UK. 25 codes across 2 product families, each taken from the manufacturer’s manuals. ESP 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.
25 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| 1 | Cooling water freezing (Cooling water temp. too low) | Yes | Yes |
| 2 | Cooling water anti freezing failure (Cooling water temp. after tube inlet too low) | Yes | Yes |
| 3 | Low pressure (Low pressure switch action) | Yes | Yes |
| 4 | Compressor exhaust temp too high (Compressor exhaust temp too high) | Yes | Yes |
| 5 | Over-current on compressor (Current through compressor too high) | Yes | Yes |
| 6 | High pressure (High pressure switch action) | Yes | Yes |
| 7 | Temp. sensor before tube failure (Temp. disengaged sensor or short circuit) | Yes | Yes |
| 8 | Tube outlet temp. sensor failure (Temp. disengaged sensor or short circuit) | Yes | Yes |
| 9 | Exhaust temp. sensor failure (Temp. disengaged sensor or short circuit) | Yes | Yes |
| E | Power supply wrong connection (Wrong connection or lack of connection) | Yes | Yes |
| E01 | High pressure protection: Exhaust pressure is too high | Not stated | Yes |
| E02 | Low pressure protection: Suction pressure is too low | Not stated | Yes |
| E03 | Water flow: Insufficient water in the system | Not stated | Yes |
| E04 | Electric Heater overheat protection: Water flow volume insufficient or the water pressure is too low | Not stated | Yes |
| E07 | Anti freeze protection: Water flow volume insufficient or the water pressure is too low | Not stated | Yes |
| E08 | Communication failure: Loss of signal from wired controller to controller | Not stated | Yes |
| E09 | Winter frost protection: Ambient temperature too low | Not stated | Yes |
| FlowError | Flow Error: integrated flow switch senses air/insufficient flow and suspends heat pump operation | Yes | Yes |
| P01 | Bottom water temp. sensor failure: Sensor is open or short-circuit | Not stated | Yes |
| P02 | Top water temp sensor failure: Sensor is open or short-circuit | Not stated | Yes |
| P04 | Ambient temp sensor failure: Sensor is open or short-circuit | Not stated | Yes |
| P05 | Coil temp sensor failure: Sensor is open or short-circuit | Not stated | Yes |
| P07 | Refrigerant absorb sensor failure: Sensor is open or short-circuit | Not stated | Yes |
| P09 | Anti-freeze temp sensor failure: Sensor is open or short-circuit | Not stated | Yes |
| P034 | Solar temp sensor failure: Sensor is open or short-circuit | Not stated | Yes |