Sensor flt:BT3 3 — Heating medium return sensor fault

What does Sensor flt:BT3 3 mean?

This alarm points to a problem with the heating medium return temperature sensor. Possible causes include an open or short circuit, or a defective sensor. The system may be attempting to reach maximum condenser supply.

• Open-circuit or short-circuit on sensor input
• Defective heating medium return sensor
• Issue with compressor during hot water charging

Click steps to track your progress.

1. 1

   Verify the heating medium return sensor connections.

2. 2

   Ensure the sensor is not damaged.

3. 3

   Reset the alarm from the alarm menu.

4. 4

   If the problem continues, seek assistance from your installer.