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Red LED continuously

Red status light continuously — Malfunction detected

Nibe · F1155 Heat Pumps

What does Red LED continuously mean?

The status light changes from solid green to solid red, indicating a malfunction has occurred. An alarm bell icon will also appear in the information window. The heat pump cannot fix this issue on its own.

Common Causes

  • A serious internal fault or malfunction.
  • An alarm condition that requires attention.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the heat pump display for a specific alarm message and code.

  2. 2

    Navigate to the alarm menu on the display and select 'reset alarm'.

  3. 3

    If the red light persists, try selecting 'aid mode' as a temporary measure.

  4. 4

    If the problem returns or persists, consult the troubleshooting section or contact a technician.

Browse all codes in this manual (27)
Verified technical data. Last updated: April 2026

Related Faults

AUX output configurationAUX output configured for specific functionAdditional heat blocked symbolAdditional heat blocked symbol — Immersion heater is not runningAlarm bell iconAlarm bell icon on display — An alarm condition is active
Source: Nibe F1155 Heat Pumps
Open Manual (Page 65)Search more codes in this manual