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Continuous light ERROR (red)

LED: ERROR (red) Continuous light — Continuous alarm is active

NIBE · S2125 Air/Water Heat Pump

What does Continuous light ERROR (red) mean?

The red ERROR LED on the base board (AA2) is continuously lit, indicating an active, continuous alarm that requires attention.

Common Causes

  • Significant system fault or error.
  • Malfunction that may stop or severely hinder operation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Immediately check the indoor module/control module display for specific alarm text and instructions.

  2. 2

    Acknowledge the alarm on the indoor module/control module.

  3. 3

    Refer to the 'Alarm list' on page 42 for the specific alarm code and troubleshooting steps.

  4. 4

    If the alarm persists after following relevant steps, contact a qualified technician.

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
Open Manual (Page 32)Search more codes in this manual