Heat pumps · Error codes · Atlantic
IF-7-4Atlantic · Alféa Hybrid Duo (heat pump + integrated fuel-oil boiler)
IF-7-4 on an Atlantic Alféa Hybrid Duo: Outdoor temperature sensor error
Short answer
On an Atlantic heat pump, IF-7-4 means: Outdoor temperature sensor 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: Outdoor temperature sensor 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 hybrid duo Installation and commissioning instructions (doc 1440-13) ↗ · 1440-13 · page 65 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026