York 7

Critical

YCAS / YVAA — VSD (variable speed drive) communications failure.

York 7: VSD (variable speed drive) communications failure. This fault typically halts operation and needs immediate attention.

Possible causes

Communication wiring to the VSD broken or VSD faulty.

Check steps

Check communication wiring to the VSD.

Affected parts

VSD-Kommunikationskabel

Safety note

Isolate power before testing.

Source: York YVAA Style A Installation, Operation & Maintenance Instructions, Table 14 "Operational and Fault/Inhibit Codes" p.114-117 (ManualsLib scan of official manual)

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

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