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Fujitsu Mini Split 23.1 Error Code

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

Quick answer

Code 23.1 means the outdoor unit sees an indoor-unit match or connection pattern it is not allowed to run. Advisory Technician Breadth evidence 43 published catalog models on its documented product line. Manual applicability notes: Fujitsu Halcyon/AIRSTAGE R-32 AOUH18KWAS2, AOUH24KWAS3, AOUH36KWAS4, and AOUH45KWAS5 outdoor-unit manuals where Section 14-3 lists the same SW1/MONITOR error-code table.; Fujitsu AOUH18KWA.

Severity: high · DIY difficulty: intermediate

Safety

TBD - must be written per-code before publish

What 23.1 means

Code 23.1 means the outdoor unit sees an indoor-unit match or connection pattern it is not allowed to run. Advisory Technician Breadth evidence 43 published catalog models on its documented product line. Manual applicability notes: Fujitsu Halcyon/AIRSTAGE R-32 AOUH18KWAS2, AOUH24KWAS3, AOUH36KWAS4, and AOUH45KWAS5 outdoor-unit manuals where Section 14-3 lists the same SW1/MONITOR error-code table.; Fujitsu AOUH18KWA.

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