HE on a Ferroli heat pump: Communication error between main board and thermostat transfer board
Short answer
On a Ferroli heat pump, HE means: Communication error between main board and thermostat transfer board. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 2 sources
What it means
On the OMNIA M 3.2 monobloc R32 (4-16 kW and 18T-30T)
The manual says: Communication error between main board and thermostat transfer board.
Likely causes:
- RT/Ta PCB enabled but thermostat transfer board not connected.
On the OMNIA S 3.2 split (wall-hung hydronic unit + OMNIA UE 3.2 outdoor)
The manual says: Communication error between main board and thermostat expansion board.
Part involved: thermostat expansion board.
Likely causes:
- RT/Ta board enabled on interface but expansion board not connected / communication interrupted.
Is it safe?
On the OMNIA M 3.2 monobloc R32 (4-16 kW and 18T-30T)
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Manual reset: Manual (13.4): reset the safety by turning the unit OFF and back ON; if unsuccessful contact your local dealer.
On the OMNIA S 3.2 split (wall-hung hydronic unit + OMNIA UE 3.2 outdoor)
| 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
- 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
On the OMNIA M 3.2 monobloc R32 (4-16 kW and 18T-30T)
- RT/Ta PCB enabled but thermostat transfer board not connected.
Who to ask for: heat pump engineer.
Certification: Electrical competence for board/wiring work.
On the OMNIA S 3.2 split (wall-hung hydronic unit + OMNIA UE 3.2 outdoor)
- RT/Ta board enabled on interface but expansion board not connected / communication interrupted.
Who to ask for: heat pump engineer.
Certification: Electrical competence for board/wiring work.
What you might notice
Sources
- OMNIA M 3.2 mod. 4-16 - Reversible heat pumps for outdoor installation with DC inverter compressor - installation/owner manual (IT-EN...) ↗ · Cod. 3QE47740 - Rev. 02 - 11/2023 · page 71 · Reviewed 23 September 2026
- 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