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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 on 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.
Connect the communication line.
I/F P.C. board error
IPDU P.C. board error
Replace fan power P.C. board.
Are communication connectors
between I/F fan power P.C. board,
and IPDU connected?
Is there voltage between pin 4 and
pin 5 of CN600 on I/F P.C. board?
(Measure with tester: DC0 to 5 V)
Is there voltage deflection between
pin 3 and pin 5 of CN600 on I/F P.C. board?
(Measure with tester: DC 0 to 5V, 5 pin GND)
On the fan power supply P.C. board,
1) CN503: Between pins 1 and 5 12V
2) CN503: Between pins 2 and 5 7V
3) Between +5V and GND of CN505: 5V
Replace P.C. board according to auxiliary code.
Is there disconnection on communication line
between IPDU and I/F P.C. board?
Check code
[E31] / [CF]
(TCC-L / AI-NET)
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
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 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 P.C. board.
Check code
[F01] / [0F]
(TCC-L / AI-NET)
Check code name
Indoor TCJ sensor error
Cause of operation
TCJ sensor Open/Short
YES
YES
NO
NO
Correct connection.
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.
Check code
[F03] / [93]
(TCC-L / AI-NET)
Check code name
Indoor TC1 sensor error
Cause of operation
TC1 sensor Open/Short
Check code
[F02] / [0d]
(TCC-L / AI-NET)
Check code name
Indoor TC2 sensor error
Cause of operation
TC2 sensor Open/Short
YES
YES
NO
NO
Correct connection.
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.
Correct connection.
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.