Indication
after launch test
operation?
U4-03
The PCBs of indoor units
displaying U9 are normal.
Check for indoor units of
other systems to troubleshoot
them according to relevant
error codes.
NO
YES
Check controller indoor units:
(1) Some error about
thermistor, or fan motor,
electronic expansion
valve, or defective PCB.
(2) Test operation was
interrupted by the MODE
(BS1) button.
YES
Check all indoor error
indication.
NO
Operate all indoor units.
YES
Do all units display U9?
Carry out the diagnosis again
after a lapse of 2 minutes or
more.
NO
Did 2 minutes or more
elapse after U9 is
displayed?
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