sensor fault BT63 — Heating medium supply after immersion heater sensor not connected or defective

What does 31 mean?

The BT63 sensor, located after the immersion heater in the heating medium supply, is not connected or defective. For VVM 500 units, this blocks internal electric addition. The alarm resets automatically.

• Loose or disconnected wiring to the BT63 sensor.
• A fault within the sensor unit itself.
• Temporary electrical glitch.

Click steps to track your progress.

1. 1

   Wait a short period to allow the system to perform an automatic reset.

2. 2

   If the alarm does not clear, power cycle the Heat Pump at the main breaker.

3. 3

   Check the physical connections to the BT63 sensor for security and integrity.

4. 4

   If the alarm persists or recurs, contact a service technician for further diagnosis.