Sens flt:BT71 128 — Heating medium return (external) sensor fault

What does Sens flt:BT71 128 mean?

This B alarm indicates a continuous fault with the heating medium return (external) sensor (BT71). This could be due to open/short circuits or a defective sensor. Heating may be blocked in conjunction with alarm 25.

• Open-circuit or short-circuit on sensor input
• Defective heating medium return (external) sensor
• Continuous contact issue with the sensor

Click steps to track your progress.

1. 1

   Verify the connections for the external heating medium return sensor.

2. 2

   Check the sensor for any damage.

3. 3

   This alarm typically resets automatically once the fault is rectified.

4. 4

   If the service technician symbol remains, contact your installer.