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Fujitsu Mini Split 11.3 Error Code

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

Quick answer

Code 11.3 means the indoor/controller communication path to the outdoor unit is not exchanging data normally. 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 11.3 means

Code 11.3 means the indoor/controller communication path to the outdoor unit is not exchanging data normally. 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.

Commonly searched as: "fujitsu 11.3" · "fujitsu error code 11.3" · "fujitsu air conditioner 11.3"

Sources

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