Heat pumps · Error codes · Ariston
936Ariston · NIMBUS NET R32 control platform (shared error list)
936 on an Ariston NIMBUS NET R32 control platform: Floor thermostat 1 error
Short answer
On an Ariston heat pump, 936 means: Floor thermostat 1 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: Floor thermostat 1 error.
Part involved: underfloor safety thermostat.
Likely causes:
- Low flow in the under-floor system.
- Floor safety thermostat open or not connected (IN-AUX2 STE of Energy Manager and/or STT of TDM).
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
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 flow of the under-floor system.
- Check the thermostat connection on IN-AUX2 STE / STT; if no UFH thermostat is present a jumper is required.
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