The number of indoor units that may be connected to an outdoor unit is determined by the
model of the outdoor unit.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
YES
YES
YES
YES
NO
NO
NO
Is the
outdoor unit and
indoor unit combination
according to the
catalog?
Is the refrigerant type of
the indoor unit and outdoor unit
matched?
Is the total number
of indoor units displaying
UA and indoor units
connectable to the same
refrigerant system within
the permitted
limit?
Press the RESET (BS5) button on the
outdoor unit main PCB for 5 seconds.
Is any fault detected?
Change the mismatched indoor or
outdoor units according to the
catalog.
YES
NO
Is the outdoor unit
main PCB replaced by the
backup PCB?
Check the model name of the
outdoor unit main PCB (A1P) and
then replace the old one.
Too many indoor units under one
refrigerant system.
Normal
Match refrigerant type of indoor
unit and outdoor unit.
Replace the outdoor unit main
PCB (A1P).
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