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ICE BUILD-UP IN THE FAN, GRILLE AND/OR FAN CONE ON S2125

ICE BUILD-UP IN THE FAN, GRILLE AND/OR FAN CONE ON S2125 — Ice is forming on the outdoor unit

NIBE · S2125 Air/Water Heat Pump

What does ICE BUILD-UP IN THE FAN, GRILLE AND/OR FAN CONE ON S2125 mean?

Ice accumulation on the fan, grille, or fan cone of the outdoor unit can impede operation and airflow.

Common Causes

  • Poor airflow across the evaporator.
  • Environmental conditions leading to ice formation.
  • Insufficient or ineffective defrosting cycles.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Activate 'fan de-icing' in the indoor module/control module settings.

  2. 2

    If the problem recurs, activate 'continuous fan de-icing' in the indoor module/control module settings.

  3. 3

    Carefully check that the air flow to S2125 is not blocked by foreign objects, leaves, snow, or ice.

  4. 4

    If heavy ice is present, gently remove accessible ice without damaging components (e.g., with warm water, not sharp tools).

Browse all codes in this manual (55)
Verified technical data. Last updated: April 2026

Related Faults

Communication fault to Inverter 254Alarm 254 (or 264, 203) Communication fault to Inverter — Inverter unpowered or brokenCompressor speed too low 354Alarm 354 (or 503, 186) Compressor speed too low — Inverter safety function reduces compressor speedContinuous light CPULED: CPU Continuous light — CPU is not running correctly
Source: NIBE S2125 Air/Water Heat Pump
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