Heat pumps · Error codes · Atlantic
ODU-2FAtlantic · Alféa Extensa + / Extensa Duo + (R410A split, 5-16)
ODU-2F on an Atlantic Alféa Extensa + / Extensa Duo +: Discharge thermistor error
Short answer
On an Atlantic heat pump, ODU-2F means: Discharge thermistor error. The heat pump keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Discharge thermistor error.
Likely causes:
- Temperature sensor short-circuit, open circuit, unplugged or faulty.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
What you can check
- Note the error number/LED pattern shown and give it to your installer.
What the engineer will check
- Check sensor wiring and connector.
- Measure sensor resistance; replace if faulty.
Who to ask for: heat pump / electrical.
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