Bosch multi-zone — Climate 5000 Generation 3 R-454B multi-zone outdoor units Error Codes Directory

Bosch PC 30 and PC 31: codes that exist on three outdoor models

PC 30 is high pressure protection and PC 31 is low pressure protection, and the service manual restricts both to three named outdoor units. An outdoor unit outside that list has no pressure switches to report on and will show a different code instead. Applies to: Climate 5000 Generation 3 R-454B multi-zone outdoor units The code table here is from the Bosch Climate 5000 Generation 3 R-454B multi-zone service manual dated May 2025, which covers the outdoor units. Indoor codes are published in the indoor service manual, and earlier Climate 5000 generations on a different refrigerant platform have their own documentation. Owner-safe checks: Record the full outdoor model number from the data plate and check it against the three models these codes are published for. | Photograph the code exactly, since the prefix and the final character both change the meaning. | Note the outdoor temperature, the mode, and how long the system had been running when it stopped. Qualified technician: Pressure measurement requires gauges on service ports and a certified technician, and this refrigerant platform has its own handling requirements. | Do not restart repeatedly against a protection code, since each attempt returns the system to the condition that stopped it.