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Fujitsu Mini Split 73.3 Error Code

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

Quick answer

Code 73.3 means the outdoor unit cannot trust the heat exchanger liquid temperature sensor reading. That reading protects compressor, inverter, pressure, or refrigerant-flow control. Advisory Technician.

Severity: high · DIY difficulty: intermediate

Safety

TBD - must be written per-code before publish

What 73.3 means

Code 73.3 means the outdoor unit cannot trust the heat exchanger liquid temperature sensor reading. That reading protects compressor, inverter, pressure, or refrigerant-flow control. Advisory Technician.

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