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Bosch Mini Split P4 Error Code

Updated 2026-08-29 · review status: draft Draft - unverified

Quick answer

P4 as Compressor drive error. Technician boundary Stop here: compressor and electrical or inverter work is technician-only. Do not open panels, test capacitors, touch wiring, connect gauges, add refrigerant, or keep resetting the system.

Severity: high · DIY difficulty: intermediate

Safety

TBD - must be written per-code before publish

What P4 means

P4 as Compressor drive error. Technician boundary Stop here: compressor and electrical or inverter work is technician-only. Do not open panels, test capacitors, touch wiring, connect gauges, add refrigerant, or keep resetting the system.

Causes, ranked

  1. Causes not yet documented — verify against the service manual.

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Sources

  • SplitAtlas manual-sourced reference — verified 2026-08-29