Alarm 5504 - Connection problem with the power guard

What does 5504 mean?

This alarm is triggered if the 'Connection problem with the power guard' warning (code 5503) is registered multiple times within 3 hours, or remains active for 30 minutes, indicating a persistent and critical communication failure.

• See possible causes for warning code 5503 (Incorrect cabling/connections, poor CANbus connections, broken or incorrect CANbus cable, interference from power cables).

Click steps to track your progress.

1. 1

   Note the alarm code 5504.

2. 2

   Contact a qualified Bosch Heat Pump installer or service technician immediately.

3. 3

   The technician will thoroughly check all cabling, connections, and the CANbus cable for proper type and separation from power cables.