Sinclair MS-H07AIC PT, Service Manual

Page: 35 / 56

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Communication malfunction of
some indoor units
Does the
broken-down indoor
unit resume normal?
De-energize the unit and check
if the connecting wire of indoor
and outdoor unit and wiring of
electric box are correct.
Is wire connected
correctly ˛
Connect wires
according to the
wiring diagram
De-energize the unit. Change the communication cable
of indoor units. Energize the unit and wait for 3 min
Yes
No
Replace mainboard
of outdoor unit
Replace the broken-down
mainboard of the indoor unit
No
Yes
End
Is malfunction
removed ˛
Yes
No