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Yellow LED solid

Yellow LED solid — Emergency mode activated

Nibe · Air Conditioning

What does Yellow LED solid mean?

A continuous yellow light on the status lamp indicates that the heat pump is operating in emergency mode. In this mode, the building is heated by an immersion heater, but hot water is not produced.

Common Causes

  • Heat pump is in emergency mode

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the display for any specific error messages related to emergency mode.

  2. 2

    If intentional, this is normal operation. If unexpected, investigate the reason for activation.

  3. 3

    Consult the manual or installer if emergency mode is not intended.

Browse all codes in this manual (95)
Verified technical data. Last updated: April 2026

Related Faults

107Sensor flt: BT7 HW sens top 107 — Sensor fault: Hot water sensor151Sen flt: CL11- BT51 pool temp sensor 151 — Sensor fault: Pool temperature sensor152Sen flt: CL12- BT51 pool temper- ature sensor 152 — Sensor fault: Pool temperature sensor
Source: Nibe Air Conditioning
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