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Sensor flt:BT1 101

Sensor flt:BT1 101 — Outdoor temperature sensor fault (continuous)

Nibe · Ground Source Heat Pumps

What does Sensor flt:BT1 101 mean?

This B alarm indicates a continuous issue with the outdoor temperature sensor. It may be due to an open/short circuit or a defective sensor. The system might be set to minimum supply temperature.

Common Causes

  • Open-circuit or short-circuit on sensor input
  • Defective outdoor temperature sensor
  • Continuous contact issue with the sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the outdoor temperature sensor is properly connected.

  2. 2

    Inspect the sensor for any damage.

  3. 3

    Since this is an information alarm, it should reset automatically if the cause is fixed.

  4. 4

    If the green light and service technician symbol persist, contact your installer.

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 50)Search more codes in this manual