Fujitsu 84.1

Critical

Airstage V-II — Current sensor 1 error (Error code 84.1).

Fujitsu 84.1: Current sensor 1 error (Error code 84.1). This fault typically halts operation and needs immediate attention.

Possible causes

Sensor or connector faulty/loose.
Wiring to the sensor broken or shorted.
Main PCB faulty (if sensor/wiring OK).

Check steps

Measure sensor resistance and compare with the reference curve.
Check connector and wiring.
If sensor/wiring OK, replace main PCB.

Affected parts

Temperatursensor
Hauptplatine

Safety note

Isolate power before testing.

Source: Fujitsu Airstage V-II VRF Service Manual, "Error Code List For Outdoor Unit" p.65 + "Trouble Shooting With Error Code (Outdoor Unit)" p.82ff (ManualsLib scan of official manual)

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

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