Sen flt: BT71 ext return sensor — Sensor fault: External return sensor

What does BT71 ext return sensor mean?

There is no contact with the external return line sensor (BT71). This may stem from an open or short circuit on the sensor input or a defective sensor. It can affect heating control.

• Open circuit or short circuit on sensor input
• Defective sensor

Click steps to track your progress.

1. 1

   Inspect the BT71 external return sensor for damage.

2. 2

   Ensure the sensor is properly connected.

3. 3

   Check the sensor's signal.

4. 4

   Replace the sensor if faulty.