Alarm 495 - sensor BT14 or BP9 loose or defective

What does 495 mean?

The discharge sensor (BT14) or high-pressure sensor (BP9) has come loose or is otherwise defective, leading to incorrect measurement values. This can affect compressor operation and system safety.

• Discharge sensor (BT14) or high-pressure sensor (BP9) has come loose.
• sensor BT14 or BP9 is defective.
• Damaged wiring to sensor BT14 or BP9.

Click steps to track your progress.

1. 1

   Turn off the Heat Pump at the main power supply before checking.

2. 2

   Visually inspect the physical mounting and wiring connections of both the BT14 and BP9 sensors to ensure they are secure.

3. 3

   Restart the Heat Pump to see if the alarm clears after ensuring connections are tight.

4. 4

   If the sensors are loose or appear damaged, contact a NIBE service technician for replacement or re-securing.