P0 appears and the unit may not start or may run at reduced capacity.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Low or high supply voltage, Faulty PFC (power factor correction) circuit on outdoor PCB, Loose mains connections, Failing DC bus capacitors

Safety first: High DC voltages are present on the inverter board. Do not touch internal components.

Steps:

Check supply: Ensure the AC is on a dedicated circuit and that there are no frequent brownouts or surges. If your area has unstable power, consider a voltage stabilizer rated for the Bosch unit.
Inspect wiring: With power off, a technician can check for loose or burnt connections at the outdoor terminal block.

If P0 persists: The outdoor PCB likely needs repair or replacement by a Bosch service center.

Professional Required 5/5

Outdoor Power / Inverter PCB

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