Heliotherm · A niche brand in the UK. 9 codes across 1 product family, each taken from the manufacturer’s manuals. Heliotherm 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.
9 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| COMPRESSOR-ERROR | High/low pressure difference falls below 3.5 bar | Yes | Yes |
| DEFROST-MIN | Heating-side inlet temperature too low during defrost (error messages "H.outH.in Dif." / "Defrost min.") | Yes | Yes |
| DEFROST-TIME | Defrosting takes too long (error message "Defrost time") | Yes | Yes |
| DISCHARGE-MAX | Discharge (hot gas) maximum temperature limit exceeded | Yes | Yes |
| ES-MOTOR-PROTECTION | Energy source (outdoor evaporator fan) motor protection tripped - protects ES drive from excessive current | Yes | Yes |
| FLOW-RATE-MIN | Temperature difference between heat outlet and inlet too high - insufficient flow/energy for defrost | Yes | Yes |
| HIGH-PRESSURE | Safety chain high pressure / condensing pressure limit exceeded | Yes | Yes |
| LOW-PRESSURE | Evaporation pressure below safety-chain limit | Yes | Yes |
| SUCTION-LINE-MIN | Suction line temperature monitoring - prevents heating water freezing during defrost/cooling | Yes | Yes |