Hitachi 0A

High

Set Free Sigma / IVX (FSXN) — Abnormal transmission between outdoor units (H-LINK)

Hitachi 0A: Abnormal transmission between outdoor units (H-LINK) This fault noticeably affects operation.

Possible causes

Faulty H-LINK connection between outdoor units A and B/C
Incorrectly connected operating line between outdoor units

Check steps

Verify operating line connections to O.U.~O.U. transmission terminals
Correct any incorrectly connected wiring and reset the power supply

Affected parts

H-LINK transmission cable
PCB1 (outdoor units A/B/C)

Safety note

Disconnect power to all involved outdoor units before working on wiring.

Source: Hitachi resmi servis kılavuzu (bağımsız çift-doğrulandı) — Hitachi FSXN Series Service Manual (manualslib.com/manual/2375584, p.196), §8 "Troubleshooting by alarm code": Alarm code 0A = "Abnormal transmission between outdoor units" (H-LINK). RUN indicator flashes, ALARM shown on remote; diagnostic flow checks H-LINK wiring between outdoor units A-B and A-C, and if wiring i…

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