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Red LED solid

Alarm — Red status lamp solid on display

NIBE · SMO S40 Control Module

What does Red LED solid mean?

The NIBE SMO S40 has detected a malfunction that it cannot automatically resolve. The status lamp will illuminate with a steady red light, and the display's smartguide will provide specific information about the alarm.

Common Causes

  • General system malfunction
  • Specific component failure
  • Communication issue within the system

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Review the smartguide on the display for detailed information about the active alarm.

  2. 2

    Select "Reset alarm and try again" on the display to attempt to clear the malfunction.

  3. 3

    If the alarm persists, consider selecting "Start auxiliary mode" to ensure the system continues to produce heat or hot water, though the red lamp will remain.

  4. 4

    If the alarm cannot be remedied, contact your certified installer for further diagnosis and repair.

Browse all codes in this manual (8)
Verified technical data. Last updated: April 2026

Related Faults

Installation pump no contactAlarm: Installation pump has no contact with the supply temperature sensorLow/No Hot WaterLow hot water temperature or a complete lack of hot waterNo Display InterferenceOperational interference without a specific display message
Source: NIBE SMO S40 Control Module
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