316 on a NIBE heat pump: Sensor fault BP4: Sensor fault, high pressure heating / low pressure cooling sensor in F2050 (BP4) [other NIBE documents: Sensor fault detected on EB101 via COM interface MHI-EMMY]
Short answer
On a NIBE heat pump, 316 means: Sensor fault BP4: Sensor fault, high pressure heating / low pressure cooling sensor in F2050 (BP4) [other NIBE documents: Sensor fault detected on EB101 via COM interface MHI-EMMY]. 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: Sensor fault BP4: Sensor fault, high pressure heating / low pressure cooling sensor in F2050 (BP4) [other NIBE documents: Sensor fault detected on EB101 via COM interface MHI-EMMY].
Part involved: temperature/pressure sensor.
When it shows: Sensor fault, high pressure heating / low pressure cooling sensor in F2050 (BP4); Sensor fault detected on EB101 via COM interface MHI-EMMY.
Likely causes:
- F2050: Open/short circuit on sensor input; sensor not working; defective control board PWB1.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: no/unknown - Compressor blocked.
Manual reset: Reset from the controller alarm menu ('reset alarm' / 'Reset alarm and try again'); alarm recurs if the cause remains.
What you can check
- Read the alarm text and the 'info/action' help on the controller display (VVM/SMO or S-series smartguide). NIBE's manuals let the homeowner select 'reset alarm' ('Reset alarm and try again' on S-series); if the lamp returns to normal the alarm has cleared. If it comes back, do not keep resetting: select 'aid mode' ('Auxiliary operation' on S-series) if offered, so any electric additional heat keeps heat/hot water going, and contact your installer.
What the engineer will check
- Check sensor and its connections/wiring against the wiring diagram; measure sensor resistance against the NIBE temperature/resistance table; check the relevant PCB input. NIBE lists: Open/short circuit on sensor input; sensor not working; defective control board PWB1.
Who to ask for: NIBE-trained heat pump installer (NIBE PRO / VIP).
Certification: Electrical work to BS 7671 by a competent person.
What you might notice
Sources
- Installer manual Air/water heat pump NIBE F2050 UK 1x230V IHB EN 2426-2 (731658) ↗ · IHB EN 2426-2 · page 45 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026