Fujitsu A3.1

Medium

Airstage V-II — Compressor 1 temperature abnormal (Error code A3.1) — sensor/protection fault, NOT refrigerant undercharge. [Code label corrected 2026-07-06 from 'E1:24' to the official value.]

Fujitsu A3.1: Compressor 1 temperature abnormal (Error code A3.1) — sensor/protection fault, NOT refrigerant undercharge. [Code label corrected 2026-07-06 from 'E1:24' to the official value.] This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Compressor temperature sensor faulty/loose.
Compressor overloaded (high discharge temperature).

Check steps

Measure sensor resistance, check connector.
Check refrigerant charge & operating pressures.

Affected parts

Verdichter-Temperaturfühler
Verdichter

Safety note

Isolate power before testing.

Source: Fujitsu Airstage V-II VRF Service Manual, "Error Code List For Outdoor Unit" p.65 (ManualsLib scan of official manual) — DÜZELTİLDİ: Code 24 listed as "Compressor 1 Temperature Abnormal" (A3.1); önceki oturumun 'muhtemelen' notu bu oturumda bağımsız 2. WebFetch ile teyit edildi.

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

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