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Set up All cooling mode.
Item code (DN)=OF
Cooling only operation mode=0001
Check flow selector unit.
Did set up All cooling
to All cooling indoor unit?
NO
YES
Are not two or more
central control system identical
network addresses connected?
Check the network adaptor
on the indoor P.C. board.
Correct the network address
of the central control system.
YES
NO
Check code name
[L20]
Check code name
Duplicated central
control addresses
Cause of operation
Central control addresses are duplicated.
Check code name
[L18]
Check code name
Flow selector unit system error
Cause of operation
An indoor unit which has been operated in
cooling only mode is operated in heating mode
without setup for cooling only mode.
Check code name
[L28]
Check code name
Quantity over of
connected outdoor units
Cause of operation
1. Quantity over of connected outdoor units
2. Connection error of communication line
between outdoor units
3. Outdoor I/F P.C. board error
NO
YES
YES
NO
Is No. of connected
outdoor units below 3 units?
Is communication line between
outdoor units correctly connected?
Max. 3 units are allowed for flex system.
Correct connection of communication line.
Check outdoor I/F P.C. board.
Replace IPDU P.C. board with trouble.
Correct connection of connector.
Replace communication line.
I/F P.C. board error
IPDU P.C. board error
Correct connection of connector.
Is there voltage fluctuation between
4 and 5 pins of CN600 on I/F P.C. board.
(Measurement by tester: DC0 to 5V, 5 pin GND)
Is there voltage fluctuation between
3 and 5 pins of CN600 on I/F P.C. board.
(Measurement by tester: DC0 to 5V, 5 pin GND)
Is jumper setup of outdoor I/F P.C. board correct?
(Jumpers 7, 8, 9 ON)
Is communication connector between IPDU and
I/F P.C. board connected?
Is there no disconnection of communication
line between IPDU and I/F P.C. board?
Both IPDU (No.1, No.2) and fan IPDU
did not return the communication.
YES
YES
YES
YES
YES
YES
NO
Replace fan power supply P.C. board.
NO
NO
NO
NO
NO
Auxiliary code
01
02
03
04
05
06
07
P.C. board to be replaced
IPDU1
IPDU2
IPDU1, 2
Fan IPDU
IPDU1, fan IPDU
IPDU2, fan IPDU
IPDU1, 2, fan IPDU, I/F
On the fan power supply P.C. board,
1) CN503: Between 1 and 5 pins
12V
2) CN503: Between 2 and 5 pins 7V
3) Between +5V and GND at the side of CN505: 5V
Check code name
[L29]
Check code name
IPDU quantity error
Cause of operation
1. Incorrect model setup in service for I/F P.C.
board
2. Communication error between IPDU, fan
IPDU and I/F
3. IPDU, fan IPDU, I/F P.C. board error
Auxiliary code :
01: IPDU1 error 02: IPDU2 error
03: IPDU1, 2 error 04: Fan IPDU error
05: IPDU1, fan IPDU error 06: IPDU2, fan IPDU error
07: All IPDU error or disconnection of communication line between IPDU-I/F P.C. board or outdoor I/F P.C. board error