Heat pumps · Error codes · Atlantic
370-86Atlantic
370-86 on an Atlantic heat pump: Pressure sensor error / pressure switch error
Short answer
On an Atlantic heat pump, 370-86 means: Pressure sensor error / pressure switch error. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 2 sources
What it means
The manual says: Pressure sensor error / pressure switch error.
Likely causes:
- Refrigerant circuit protection (pressure/temperature out of range).
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
What you can check
- Check the outdoor unit is not blocked by leaves, debris or snow.
- Note the error number/LED pattern shown and give it to your installer.
What the engineer will check
- Check refrigerant charge and leaks, expansion valve, pressure sensor/switch and airflow.
- Check water flow through the plate heat exchanger.
Who to ask for: refrigeration (F-gas).
Certification: F-gas certification for refrigerant work.
What you might notice
Sources
- Alféa Excellia A.I. Installation manual (U0611757_1876_EN_14) ↗ · U0611757_1876_EN_14 · page 77 · Reviewed 23 September 2026
- Alfea Extensa A.I. R32 Installation manual (U0671217_2114_EN_11) ↗ · U0671217_2114_EN_11 · page 72 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026