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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
Is jumper lead setup of the outdoor I/F P.C. board correct?
(Jumper 7, 8, 9 ON)
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
YES
Connect the jumper lead.
Correct connection of connectors.
Replace communication line.
I/F P.C. board error
IPDU P.C. board error
Replace fan power supply P.C. board.
Are communication connectors
between I/F, fan power supply board,
and IPDU connected?
Is there voltage deflection between
4 and 5 pins of CN600 on I/F P.C. board?
(Measurement with tester: DC 0 to 5V, 5 pin GND)
Is there voltage deflection between
3 and 5 pins of CN600 on I/F P.C. board?
(Measurement with tester: DC 0 to 5V, 5 pin GND)
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
Replace P.C. board according to auxiliary code.
When IPDU (No.1, No.2) and
three fan IPDU do not return communication
Is there no disconnection of communication line
between I/F, fan power supply board, and IPDU?
Check code
[E31]
Check code name
IPDU communication error
Cause of operation
1. Connection error of communication line
between IPDU and I/F P.C. board
2. I/F P.C. board error
3. IPDU P.C. board error
4. External noise
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 communication line error between IPDU-I/F P.C. boards, or outdoor I/F P.C. board error
∗ If the fan IPDU is abnormal, be sure to check the voltage output on the fan power supply P.C. board.
Check code
[F01]
Check code name
Indoor TCJ sensor error
Cause of operation
TCJ sensor Open/Short
Check code
[F03]
Check code name
Indoor TC1 sensor error
Cause of operation
TC1 sensor Open/Short
Check code
[F02]
Check code name
Indoor TC2 sensor error
Cause of operation
TC2 sensor Open/Short
Correct connection of connector.
Replace TC2 sensor.
Is TC2 sensor connector (CN101: Black)
on indoor P.C. board normally connected?
Are characteristics of TC2 sensor
resistance value normal?
Check indoor main P.C. board.
Defect Replace
YES
YES
NO
NO
Indoor unit temperature sensor characteristics
See Characteristics-2.
YES
YES
NO
NO
Correct connection of connector.
Replace TCJ sensor.
Is TCJ sensor connector (CN102: Red)
on indoor P.C. board normally connected?
Are characteristics of TCJ sensor
resistance value normal?
Check indoor main P.C. board.
Defect Replace
Indoor unit temperature sensor characteristics
See Characteristics-2.
YES
YES
NO
NO
Correct connection of connector.
Replace TC1 sensor.
Is TC1 sensor connector (CN100: Brown)
on indoor P.C. board normally connected?
Are characteristics of TC1 sensor
resistance value normal?
Check indoor main P.C. board.
Defect Replace
Indoor unit temperature sensor characteristics
See Characteristics-2.