583 on a NIBE heat pump: Low flow defrosting (slave EB102-EB108) (listed as range 582-588): Low flow during defrosting in one of EB102-EB108
Short answer
On a NIBE heat pump, 583 means: Low flow defrosting (slave EB102-EB108) (listed as range 582-588): Low flow during defrosting in one of EB102-EB108. The heat pump keeps running with some functions stopped.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Low flow defrosting (slave EB102-EB108) (listed as range 582-588): Low flow during defrosting in one of EB102-EB108.
Part involved: evaporator defrost.
When it shows: Low flow during defrosting in one of EB102-EB108.
Likely causes:
- Flow-related; clogged particle filter; defective circulation pump.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Warning |
The heat pump keeps running with some functions stopped.
Resetting itself: yes - Defrosting stops.
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. Check the outdoor unit is not blocked by leaves, snow or ice and that nothing obstructs the airflow.
What the engineer will check
- Check system volume and flow during defrost, particle filter, circulation pump, evaporator airflow, evaporator/defrost sensors and refrigerant circuit. NIBE lists: Flow-related; clogged particle filter; defective circulation pump.
Who to ask for: NIBE-trained heat pump installer (NIBE PRO / VIP).
Certification: None specific beyond competent heat pump installer; electrical work to BS 7671.
What you might notice
Sources
- TECHNICAL INFORMATION - ALARM LIST SMO 40 (TIF EN 2042-1, M12658EN) ↗ · TIF EN 2042-1 M12658EN · page 21 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026