Heat pumps · Error codes · Ferroli
L7Ferroli · OMNIA S 3.2 split (wall-hung hydronic unit + OMNIA UE 3.2 outdoor)
L7 on a Ferroli OMNIA S 3.2 split: Phase sequence error
Short answer
On a Ferroli heat pump, L7 means: Phase sequence error. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Phase sequence error.
Part involved: compressor phases.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Manual reset: Manual (sect. 10.3): reset the safety device by turning the unit OFF and back ON; if unsuccessful contact the local dealer.
What you can check
- Check the consumer-unit breaker/isolator for the heat pump is on.
- Note the code shown on the user interface and contact the installer/Ferroli service.
- The manual says the safety can be reset by switching the unit OFF and back ON; if the code returns, do not keep resetting - call the installer.
What the engineer will check
Who to ask for: heat pump engineer.
Certification: Electrical competence for board/wiring work.
What you might notice
Sources
- OMNIA S 3.2 - Installation, use and maintenance manual (IT-EN-ES-PT-FR-DE-NL) ↗ · Cod. 3541V942 - Rev. 01 - 06/2026 · page 126 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026