Bosch Mini Split P0 Error Code

Updated 2026-08-30 · review status: manual-verified · reviewed by MiniSplitDecoder Editorial Team Last verified: 2026-08-30

Check your model first

  • Bosch Climate 5000 Gen 2 single-zone (BMS500-A..)
  • Bosch multi-zone (variant meanings by display)
  • Bosch Climate 5000 Gen 3 (PC 00 equivalent)
  • Bosch Climate 5000 Gen 2 single-zone
  • Bosch multi-zone outdoor board
  • Bosch multi-zone indoor display

Match the model on your equipment label to the linked manufacturer documentation. The same code can mean different things across model families.

Quick answer

P0 on a Bosch Climate 5000 Gen 2 single-zone system is an inverter module (IPM) error - the power electronics driving the compressor report a fault and the system stops on purpose. One reset is a legitimate diagnostic step; the IPM itself is high-voltage technician-only territory.

Severity: high · DIY difficulty: easy

Safety

Stop at the breaker power-cycle and any plug-accessible checks (filters, remote settings, visible wiring). The outdoor unit's capacitor holds a lethal charge and the refrigerant circuit is both pressurized and (on R-32 units) flammable — opening panels or servicing the sealed system is licensed-technician work (EPA 608).

What P0 means

P0 means an inverter module (IPM) error on Bosch Climate 5000 Gen 2 single-zone systems (1 lamp flashing; Gen 3 equivalent PC 00). Heat Pump Answers: the IPM (intelligent power module) is the block of power electronics that drives the compressor at variable speed; when it reports a fault the system stops on purpose, and it is a Stop-level high-voltage fault for a licensed technician. On multi-zone systems the display decides the meaning: outdoor-board P0 is compressor top high-temperature protection, while indoor-display P0 is the same IPM fault seen from the indoor side.

Code meaning varies by series

  • Bosch Climate 5000 Gen 2 single-zone: Inverter module (IPM) error / IGBT over-current (indoor LED: 1 flashing; Gen 3 equivalent PC 00)
  • Bosch multi-zone outdoor board: Compressor top high-temperature protection (P0 on the outdoor unit is a different fault from indoor P0)
  • Bosch multi-zone indoor display: IPM malfunction seen from the indoor side (multi-zone outdoor board shows it as P6)

First checks before service

This page currently documents the safe reset triage. If the code returns, use the linked source manual or a qualified technician for code-specific diagnosis.

  1. 1. One-time fault event (power disturbance or transient sensor reading) common DIY

    Check: Power-cycle at the breaker/disconnect (or unplug for CPAP), restore, and run the system while watching for the code.

    Fix: If the code does not return after a full run cycle, the fault was transient — monitor, no repair needed.

  2. 2. Fault persists after a clean reset occasional pro only

    Check: If the code returns immediately or every session, note the conditions (startup, heating, after rain).

    Fix: A persisting code points at the component the manual assigns to this code — that repair is technician territory.

Related codes

Cross-references for the same fault family, by brand:

Bosch P1 · Bosch P4

Commonly searched as: "bosch p0" · "bosch error code p0" · "bosch air conditioner p0"

Sources

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