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153
Set up All cooling mode.
Item code (DN)=OF
Cooling only operation mode=0001
Check flow selector unit.
Is every indoor unit been
set up for cooling only mode?
NO
YES
Are two or more
central control system with 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
[L20] / [98]
(TCC-L / AI-NET)
Check code name
Duplicated central
control addresses
Cause of operation
Central control addresses are duplicated.
Check code
[L18] / [8A]
(TCC-L / AI-NET)
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.
NO
YES
YES
NO
Is No. of connected
outdoor units below 3 units?
Is the communication line
between outdoor units correct?
Max. 3 units are allowed for flex system.
Correct connection of the communication line.
Check outdoor I/F P.C. board.
Replace IPDU P.C. board with trouble.
Correct connection.
Reconnect communication line.
I/F P.C. board error
IPDU P.C. board error
Correct connection.
Is there voltage fluctuation between
pin 4 and pin 5 of CN600 on I/F P.C. board
(measure by tester: DC 0 to 5 V).
Is there voltage fluctuation between
pin 3 and pin 5 of CN600 on I/F P.C. board
(measure by tester: DC 0 to 5 V).
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 the communication line between
IPDU and I/F P.C. board disconnected?
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 on 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
[L29] / [CF]
(TCC-L / AI-NET)
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
Sub-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
Check code
[L28] / [46]
(TCC-L / AI-NET)
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