NG
Check the error display of each Branch Box (Primary or Secondary)
Replace Controller PCB of Branch Box (Primary or Secondary) of error and execute the check operation again.
Check the error display of Indoor unit
Replace Controller PCB of indoor unit of error
Case 2. When more than one indoor unit error (2unit or 3 unit)
NG
Replace Controller PCB
Replace Controller PCB of Branch Box(Primary) and execute the check operation again.
Check the error of Branch Box(Primary)
Case 3. When all indoor unit error
Check the error display of each Branch Box(Secondary)
When Branch Box(Secondary) error
Replace Controller PCB of Branch Box(Secondary) of error
and execute the check operation again.
When Outdoor unit error
Check Point 1 Check the Outdoor Unit Filter PCB
Check F502 Fuse in Outdoor Unit Filter PCB.
>> If Fuse is open, replace F502 Fuse and Main PCB.
Check the LED display of outdoor unit
Check F380 Fuse in Outdoor Unit Inverter PCB.
>> If Fuse is open, replace F380 Fuse and Main PCB.
If does not improve the symptom,
>> Replace F380 Fuse and Main PCB.
>> Replace Inverter PCB and Protector P501 of Filter PCB.( If Destruction of IPM or DB)
>> Replace Inverter PCB , ACTPM and Protector P501 of Filter PCB.
Check the error display of Outdoor unit
Replace Main PCB of Outdoor unit and
execute the check operation again.
NG
Check the error of Branch Box(Secondary) or error of Outdoor unit
When there is no LED display of outdoor unit
02-16
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