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Continuous light DEFROST (green)

LED: DEFROST (green) Continuous light — Defrosting in progress

NIBE · S2125 Air/Water Heat Pump

What does Continuous light DEFROST (green) mean?

The green DEFROST LED on the base board (AA2) is continuously lit, indicating that a defrosting cycle is currently in progress.

Common Causes

  • Normal defrosting cycle due to ice buildup or operating conditions.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    No action needed for this LED state, it indicates normal defrosting operation.

  2. 2

    If defrosting occurs too frequently or does not resolve ice build-up, refer to 'ICE BUILD-UP IN THE FAN, GRILLE AND/OR FAN CONE ON S2125' troubleshooting.

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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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