5355 - Bosch Heat Pump Z1 compressor overcurrent alarm

What does 5355 mean?

This alarm signifies that the compressor in Bosch Heat Pump zone 1 is drawing too much current. It activates after 3 warnings in 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

   Visually inspect all cabling between the inverter and the 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 overcurrent alarm returns, contact a qualified technician to investigate the wiring, compressor, and inverter.