5357 - Bosch Heat Pump Z2 compressor overcurrent alarm

What does 5357 mean?

This alarm indicates that the compressor in Bosch Heat Pump zone 2 is drawing excessive current. It triggers after 3 warnings within 3 hours, or if a warning is active for 30 minutes.

• Failure or short circuit in the cabling between the inverter and compressor.
• An electrical fault within the compressor itself.
• The inverter is not functioning correctly.

Click steps to track your progress.

1. 1

   Inspect all cabling between the inverter and compressor for any signs of damage or short circuits.

2. 2

   Reset the Heat Pump by cycling its power at the main breaker.

3. 3

   If the problem persists, contact a qualified technician to measure compressor winding resistance and examine the inverter.