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Flt: Sft-start

Flt: Sft-start — Faulty soft start card fuses

Nibe · Ground Source Heat Pumps

What does Flt: Sft-start mean?

This alarm indicates that the fuses for the large soft start card are defective. This applies to 30, 40, and 60 kW models and will block the compressor.

Common Causes

  • Defective fuses for the soft start card

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check and replace the fuses for the soft start card.

  2. 2

    If fuses repeatedly blow, contact a service technician.

Browse all codes in this manual (49)
Verified technical data. Last updated: April 2026

Related Faults

Alarm bell in displayAlarm bell symbol in display — Malfunction detectedAlarm no. 54Alarm no. 54 — Motor protection breaker trippedAlarm numbers 70-99Alarm numbers 70-99 — Communication interrupted
Source: Nibe Ground Source Heat Pumps
Open Manual (Page 48)Search more codes in this manual