What does 154 403 mean?

There is a sensor fault in the outdoor unit, indicated by 'Sensor fault from PCA 154 403'. Refer to the relevant manual for details.

• Sensor fault in the outdoor unit

Click steps to track your progress.

1. 1

   Consult the relevant manual for specific troubleshooting steps related to 'Sensor fault from PCA 154 403'.

2. 2

   Check sensors in the outdoor unit for proper function.

3. 3

   Inspect connections to the PCA.

4. 4

   Contact a service technician.