MG-CTT: Magnet contactor
Check code
Location
of
detection
Description
System
status
Check code
detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
F29 –
–
Indoor
unit
Other indoor
trouble
Stop of
corresponding
unit
Indoor P.C. board does not
operate normally.
• Check for defect in indoor P.C.
board (
Trouble
EEPROM)
F31 F31
–
I/F
Outdoor
EEPROM
trouble
All stop *1
Outdoor P.C. board (I/F)
does not operate normally.
• Check power supply voltage.
• Check power supply noise.
• Check for
trouble
in outdoor
P.
C. board (I/F).
H01 H01
01: Compressor 1 side
02: Compressor 2 side
IPDU
Compressor
breakdown
All stop
Inverter current detection
circuit detects overcurrent
and shuts system down.
• Check power supply voltage.
(AC380-415V ± 10%).
• Check for
trouble
in
compressor.
• Check for possible cause of
abnormal overloading.
• Check for
trouble
in outdoor
P.
C. board (A3-IPDU).
H02 H02
01: Compressor 1 side
02: Compressor 2 side
IPDU
Compressor
trouble
(lockup)
MG-CTT
trouble
All stop
Overcurrent is detected
several seconds after
startup of inverter
compressor.
• Check for
trouble
in
compressor.
• Check power supply voltage.
(AC380-415V ± 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
problem
inside compressor.)
• Check for
trouble
in outdoor
P.
C. board (A3-IPDU).
• Check outdoor MG-CTT.
H03 H03
01: Compressor 1 side
02: Compressor 2 side
IPDU
Current
detection
circuit
trouble
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
trouble
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
trouble
in outdoor
P.
C. board (I/F).
H06 H06
–
I/F
Activation of
low-pressure
protection
All stop
Low-pressure P
S
sensor
detects operating pressure
lower than 0.02MPa.
• Check service valves to
confirm full opening
(both gas and liquid sides).
• Check outdoor PMVs for
clogging (PMV1).
•
•
Check for
trouble
in SV2 or
SV4 circuits.
Check for
trouble
in low-
pressure P
S
sensor.
• Check indoor filter for clogging.
• Check valve opening status of
indoor PMV.
• Check refrigerant piping for
clogging.
• Check operation of outdoor fan
(during heating).
• Check for insufficiency in
refrigerant quantity.
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