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Check code
Location
of
detection
System statusDescription
Error detection
condition(s)
Check items (locations)
Outdoor 7-segment display
Main
remote
controller
Check
code
Sub-code
I/F
F31 —F31
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).
Outdoor
EEPROM error
IPDU01:
Compressor 1 side
02:
Compressor 2 side
03:
Compressor 3 side
H01H01
All stop Inverter current
detection circuit
detects overcurrent
and shuts system
down.
• Check power supply voltage.
(FT9 : 208/230V ± 10%, FT6 : 460V ± 10%).
• Check for defect in compressor.
• Check for possible cause of abnormal
overloading.
• Check for defect in outdoor P.C. board
(A3-IPDU).
Compressor
breakdown
IPDU01:
Compressor 1 side
02:
Compressor 2 side
03:
Compressor 3 side
H02H02
All stop Overcurrent is
detected several
seconds after startup
of inverter
compressor.
• Check for defect in compressor.
• Check power supply voltage.
(FT9 : 208/230V ± 10%, FT6 : 460V ± 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.
Compressor
error (lockup)
MG-CTT error
IPDU01:
Compressor 1 side
02:
Compressor 2 side
03:
Compressor 3 side
H03H03
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).
Current detection
circuit error
I/F
H05 —H05
All stop Discharge
temperature of
compressor 1 (TD1)
does not increase
despite compressor
being in operation.
• Check installation of TD1, TK1, TK2,
TK3, TK4, TK5 sensor.
• Check connection of TD1, TK1, TK2,
TK3, TK4, TK5 sensor connector and
wiring.
• Check resistance characteristics of TD1
sensor.
• Check for defect in outdoor P.C. board
(I/F).
TD1 sensor
miswiring
(incomplete
insertion)
I/F
H06 —H06
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
MG-CTT: Magnet contactor
All stop Low-pressure Ps
sensor detects
operating pressure
lower than 0.02MPa.
• Check service valves to confirm full
opening (both discharge gas side, suction
gas side and liquid sides).
• Check outdoor PMVs for clogging
(PMV1, 2).
• Check for defect in SV2 or SV4 circuits.
• Check for defect in lowpressure
Ps sensor.
• Check indoor filter for clogging.
•
Check valve opening status of indoor PMV.
• Check refrigerant piping for clogging.
• Check operation of outdoor fan (during In
all heating, collective operation).
• Check for insufficiency in refrigerant
quantity.
• Check clogging in circuit at sub heat
exchanger liquid side .
(PMV4, Checked valve)
• Check 4-way valve error (Reversal error)
• Check miswiring of discharge/suction gas
main piping.
• Check Cool/Heat FS unit.
• Check mispiping of discharge/suction gas
piping to Cool/Heat FS unit.
• Check piping between Cool/Heat FS unit
and room.
• Check miswiring of SVD/SVS valve, and
mis mounting of coil.
• Check opened status of SVS valve.
• Check SV14 circuit error
Activation of
low-pressure
protection
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