122
MG-CTT: Magnet contactor
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Check code
Location
of
detection
Description System status Error detection condition(s) Check items (locations)
Wired
remote
control
Outdoor 7-segment display
Check
code
Sub-code
F23 F23 –
I/F Ps sensor error All stop Output voltage of Ps sensor is zero. • Check for connection error
involving Ps sensor and Pd
sensor connectors.
• Check connection of Ps sensor
connector.
• Check for defect in Ps sensor.
• Check for deficiency in
compressive output of
compressor.
• Check for defect in 4-way valve.
• Check for defect in outdoor P.C.
board (I/F).
• Check for defect in SV4 circuit.
F24 F24 –
I/F Pd sensor error All stop Output voltage of Pd sensor is zero
(sensor open-circuited).
Pd > 602 psi (4.15 MPa) despite
compressor having been turned off.
• Check connection of Pd sensor
connector.
• Check for defect in Pd sensor.
• Check for defect in outdoor P.C.
board (I/F).
F29 – –
Indoor
unit
Other indoor
error
Stop of
corresponding
unit
Indoor P.C. board does not operate
normally.
• Check for defect in indoor P.C.
board (faulty EEPROM)
F31 F31 –
I/F Outdoor
EEPROM error
All stop *1 Outdoor P.C. board (I/F) does not
operate normally.
• Check power supply voltage.
• Check power supply noise.
• Check for defect in outdoor P.C.
board (I/F).
H01 H01
01:
Compressor 1
side
02:
Compressor 2
side
03:
Compressor 3
side
IPDU Compressor
breakdown
All stop Inverter current detection circuit
detects overcurrent and shuts
system down.
• Check power supply voltage. (AC
460 V ± 10 %).
• Check for defect in compressor.
• Check for possible cause of
abnormal overloading.
• Check for defect in outdoor P.C.
board (A3-IPDU).
H02 H02
01:
Compressor 1
side
02:
Compressor 2
side
03:
Compressor 3
side
IPDU Compressor
error (lockup)
MG-CTT error
All stop Overcurrent is detected several
seconds after startup of inverter
compressor.
• Check for defect in compressor.
• Check power supply voltage. (AC
460 V ± 10 %).
• Check compressor system
wiring, particularly for open
phase.
• Check connection of connectors/
terminals on A3-IPDU P.C.
board.
• Check conductivity of case
heater.
(Check for refrigerant entrapment
inside compressor.)
• Check for defect in outdoor P.C.
board (A3-IPDU).
• Check outdoor MG-CTT.
H03 H03
01:
Compressor 1
side
02:
Compressor 2
side
03:
Compressor 3
side
IPDU Current
detection circuit
error
All stop Current flow of at least specified
magnitude is detected despite
inverter compressor having been
shut turned off.
• Check current detection circuit
wiring.
• Check defect in outdoor P.C.
board (A3-IPDU).
H05 H05 –
I/F TD1 sensor
miswiring
(incomplete
insertion)
All stop Discharge temperature of
compressor 1 (TD1) does not
increase despite compressor being
in operation.
• Check installation of TD1 sensor.
• Check connection of TD1 sensor
connector and wiring.
• Check resistance characteristics
of TD1 sensor.
• Check for defect in outdoor P.C.
board (I/F).
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