sensor fault BT29 — Compressor oil temperature sensor not connected or defective

What does 29 mean?

The BT29 sensor, which measures the compressor oil temperature, is not connected or defective. This fault will block the compressor from operating.

• BT29 sensor is disconnected or has a loose connection.
• The sensor unit itself is faulty.
• Damaged wiring to the sensor.

Click steps to track your progress.

1. 1

   Turn off the Heat Pump at its main power supply immediately.

2. 2

   Inspect the BT29 sensor and its wiring connections for tightness and damage.

3. 3

   Ensure the sensor is correctly installed in the compressor oil system.

4. 4

   Restore power and check if the alarm clears.

5. 5

   If the alarm persists, contact a qualified NIBE technician, as this fault affects critical compressor operation.