Daikin VRVII Manual page 379

"Outdoor Unit C" using a multiple meter. If there is
continuity between the said transmission wirings, the
indoor-outdoor unit transmission wiring has no broken
wires in it.
If there is no continuity, the transmission wiring may
have broken wires. With the indoor-outdoor unit
terminal of the "Outdoor Unit C" short circuited,
identify the place with continuity in the transmission
wiring of the "Indoor Unit b", transmission wiring of the
"Indoor Unit c", and transmission wiring of the "Indoor
Unit d" in the order described.
If the place with continuity can be identified, there may
be broken wires in places before the said place with
continuity.
Check the transmission
wiring for continuity.
If there is continuity, the
indoor-outdoor unit
transmission has no
broken wires in it.
374
Troubleshooting by Indication on the Remote Controller
Indoor-outdoor Unit
Transmission Wiring
Short circuit between
the indoor-outdoor unit
terminal parts.
Unified ON/OFF controller Centralized remote controller
Short circuit
between the
outdoor-outdoor
unit terminal
parts.
Outdoor-outdoor Unit
Transmission Wiring
Check the transmission
wiring for continuity.
If there is continuity, the
outdoor-outdoor unit
transmission has no broken
wires in it.