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Bosch Mini Split P3 Error Code

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

Quick answer

P3 means outdoor unit low temperature lockout. In plain English, outdoor temperature is outside the range the unit allows, or the outdoor unit is reading it that way. Advisory DIY.

Severity: high · DIY difficulty: intermediate

Safety

TBD - must be written per-code before publish

What P3 means

P3 means outdoor unit low temperature lockout. In plain English, outdoor temperature is outside the range the unit allows, or the outdoor unit is reading it that way. Advisory DIY.

Causes, ranked

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

Commonly searched as: "bosch p3" · "bosch error code p3" · "bosch air conditioner p3"

Sources

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