Warning Z1 5503 - Connection problem with the power guard

What does 5503 mean?

This warning indicates that communication between the Heat Pump's installer module and the power guard system has been lost for 30 seconds. This suggests a wiring or cable issue.

• Incorrect cabling or connections.
• Poor connection in the CANbus connections on either the installer module or power guard.
• Interruption or break in the CANbus cable.
• Incorrect type of CANbus cable used.
• CANbus cable installed too close to supply voltage, causing interference.

Click steps to track your progress.

1. 1

   Note the warning code 5503.

2. 2

   Contact a qualified Bosch Heat Pump installer or service technician.

3. 3

   The technician will check the cabling, connections, and verify the correct type and installation of the CANbus cable.