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Flashes EXT COM (green)

LED: EXT COM (green) Flashes — Communication with indoor module/control module is active

NIBE · S2125 Air/Water Heat Pump

What does Flashes EXT COM (green) mean?

The green EXT COM LED on the base board (AA2) is flashing, which is the normal indication of active communication with the indoor module or control module.

Common Causes

  • Normal operating condition.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

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

  2. 2

    If other problems are occurring, investigate other LED states or display alarms.

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