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Continuous light K1, K2, K3, K4, K5

LED: K1, K2, K3, K4, K5 Continuous light — Relay is activated

NIBE · S2125 Air/Water Heat Pump

What does Continuous light K1, K2, K3, K4, K5 mean?

Any of the K1-K5 LEDs on the base board (AA2) are continuously lit, indicating that the corresponding relay has been activated (is on).

Common Causes

  • Normal state when the relay function is active (e.g., compressor, fan).
  • Demand for the circuit controlled by the relay.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    No action needed for this LED state if the associated function is expected to be active.

  2. 2

    If a relay is active when it shouldn't be, or if a function is not working despite the relay being active, check system demand and settings on the indoor module/control module.

  3. 3

    If there's a discrepancy, contact support for further diagnosis.

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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