NIBE · S2125 Air/Water Heat Pump
Any of the K1-K5 LEDs on the base board (AA2) are continuously lit, indicating that the corresponding relay has been activated (is on).
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No action needed for this LED state if the associated function is expected to be active.
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.
If there's a discrepancy, contact support for further diagnosis.