Heat pumps · Error codes · Atlantic
ODU-11FAtlantic · Alféa Extensa + / Extensa Duo + (R410A split, 5-16)
ODU-11F on an Atlantic Alféa Extensa + / Extensa Duo +: Discharge temperature protection (permanent stoppage)
Short answer
On an Atlantic heat pump, ODU-11F means: Discharge temperature protection (permanent stoppage). The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Discharge temperature protection (permanent stoppage).
Likely causes:
- Refrigerant circuit protection (pressure/temperature out of range).
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Safety lockout |
| 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.
Sources
- alféa extensa + Installation and operating manual (doc 1734-10, 1734-EN) ↗ · 1734-10 · page 77 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026