sensor fault BT3 — Heating medium return sensor not connected or defective (hot water loading)

What does 3 mean?

The BT3 sensor, often used for heating medium return, is not connected or defective. When this alarm occurs, the compressor will be blocked during hot water loading.

• BT3 sensor is disconnected or has a loose connection.
• The sensor unit itself is faulty or damaged.
• Wiring to the BT3 sensor is damaged or improperly installed.

Click steps to track your progress.

1. 1

   Power off the Heat Pump at the main electrical supply for 30 seconds.

2. 2

   Locate the BT3 sensor and visually inspect its connections for tightness and integrity.

3. 3

   Check for any signs of physical damage to the sensor or its wiring.

4. 4

   Restore power to the Heat Pump and see if the alarm is resolved.

5. 5

   If the alarm remains, professional assistance may be required for sensor replacement or circuit diagnosis.