sensor fault BT3 — sensor temporarily missing

What does 103 mean?

The BT3 sensor, which measures heating medium return (hot water loading), is temporarily not detected by the system.

• Loose or intermittent connection to the BT3 sensor.
• Temporary electrical interference.
• A momentary fault in the sensor itself or its wiring.

Click steps to track your progress.

1. 1

   Wait a few minutes to see if the sensor communication restores itself and the alarm clears.

2. 2

   Power cycle the Heat Pump by turning it off at the main breaker for 30 seconds, then turning it back on.

3. 3

   Inspect the physical connections to the BT3 sensor to ensure they are secure.

4. 4

   If the alarm recurs frequently, a service technician may need to investigate the sensor or wiring.