Alarm 533 - sensor fault BT15

What does 533 mean?

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BT15. This indicates a problem with the sensor itself or its wiring.

• Open-circuit or short-circuit on the BT15 sensor input.
• Defective BT15 sensor.
• Loose or damaged wiring to the BT15 sensor.

Click steps to track your progress.

1. 1

   Visually inspect the wiring connected to sensor BT15 for any signs of damage or loose connections.

2. 2

   Turn off the Heat Pump at the main power switch for a few minutes, then turn it back on to reset the system.

3. 3

   If the alarm persists, contact a NIBE service technician to check or replace the BT15 sensor.