Heat pumps · Error codes · Ariston
2P7Ariston · NIMBUS NET R32 control platform (shared error list)
2P7 on an Ariston NIMBUS NET R32 control platform: Precirculation error
Short answer
On an Ariston heat pump, 2P7 means: Precirculation 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: Precirculation error.
Part involved: flow meter / pre-circulation.
Likely causes:
- Flow meter connection.
- Air in the system.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
What you can check
- Note the error code shown on the Sensys HD interface and contact the installer / Ariston service.
What the engineer will check
- Check the connection of the flow meter.
- Run an automatic deaeration cycle (parameter 1.12.0).
Who to ask for: heat pump controls / hydronics.
Certification: Competent heating engineer; electrical competence for wiring checks.
What you might notice
Sources
- NIMBUS PLUS M NET R32 - Technical instructions for installation and maintenance (UK) - codes 3301719 3301720, doc 420000656201 EN ↗ · 420011311701 - 03/2024 · page 71 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026