Sinclair SYMPHONY MS-H09AISW PT Service Manual page 33

5. E6 Malfunction
Communication malfunction of
some indoor units
De-energize the unit and check
if the connecting wire of indoor
and outdoor unit and wiring of
electric box are correct.
De-energize the unit. Change the communication cable
of indoor units. Energize the unit and wait for 3 min
broken-down indoor
unit resume normal?
Replace the broken-down
mainboard of the indoor unit
No
Is wire connected
correctly
Yes
Does the
Yes
No
End
Connect wires
according to the
wiring diagram
Replace mainboard
of outdoor unit
Yes
Is malfunction
removed
No
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