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Red LED solid

Red status lamp solid — Malfunction occurred

Nibe · SMO 20 Control Module

What does Red LED solid mean?

The status lamp changing from green to red indicates a malfunction. An alarm icon will also appear on the display. This means the system cannot fix the problem on its own.

Common Causes

  • Malfunction in the heat pump or control module
  • External fault requiring attention

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Press the control knob and OK button to view the specific alarm message on the display.

  2. 2

    Read the alarm description and follow the provided tips to correct the problem.

  3. 3

    If the problem persists after attempting a fix, select 'reset alarm' to see if the system returns to normal operation.

  4. 4

    Consider setting the system to 'aid mode' for temporary heating and hot water, but note this does not fix the underlying issue.

  5. 5

    Check electrical connections and fuses as described in the troubleshooting section.

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

Related Faults

Alarm bell iconAlarm bell icon on display — Malfunction detectedLow 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 needed
Source: Nibe SMO 20 Control Module
Open Manual (Page 45)Search more codes in this manual