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Alarm bell appears

Alarm bell appears on display — System malfunction alert

Nibe · SHB 20

What does Alarm bell appears mean?

An alarm bell symbol indicates that a malfunction has occurred. The control module will usually show instructions on the display to fix it.

Common Causes

  • System detected an issue
  • Configuration error
  • Component failure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the display for specific alarm messages and instructions.

  2. 2

    Follow any on-screen guidance to address the problem.

  3. 3

    If the display is not lit or no instructions appear, proceed with general troubleshooting steps.

  4. 4

    Contact your installer if the issue persists.

Browse all codes in this manual (15)
Verified technical data. Last updated: April 2026

Related Faults

Additional heat blocked symbolAdditional heat blocked symbol — Auxiliary heat prevented from runningCompressor blocked symbolCompressor blocked symbol — Compressor prevented from runningCooling active symbolCooling active symbol — Cooling function is currently enabled
Source: Nibe SHB 20
Open Manual (Page 90)Search more codes in this manual