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Alarm bell icon

Alarm bell icon on display — Malfunction detected

Nibe · SMO 20 Control Module

What does Alarm bell icon mean?

This icon, appearing with a red status lamp, signifies a malfunction that the system cannot resolve automatically. The display will show the type of alarm and offer potential solutions.

Common Causes

  • Internal system error
  • External fault

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Navigate the menu to find the specific alarm message.

  2. 2

    Read the details to understand the cause of the alarm.

  3. 3

    Follow any suggested troubleshooting steps shown on the display.

  4. 4

    Attempt to reset the alarm via the control module menu.

  5. 5

    Contact support if the issue cannot be resolved.

Browse all codes in this manual (5)
Verified technical data. Last updated: April 2026

Related Faults

Low hot water temperature or lack of hot waterLow hot water temperature or no hot water — Potential causes identifiedNo display message but operational interferenceNo display message, but system not operating correctly — Basic checks neededRed LED solidRed status lamp solid — Malfunction occurred
Source: Nibe SMO 20 Control Module
Open Manual (Page 45)Search more codes in this manual