– 65 –
Main
remote
control
Check code
P04
P04
01: Compressor 1 side
02: Compressor 2 side
IPDU
Activation of
high-pressure
SW
All stop
High-pressure SW is activated.
• Check connection of highpressure
SW connector.
• Check for defect in Pd pressure
sensor.
• Check outdoor service valves
(gas side, liquid side) to confirm
full opening.
• Check for defect in outdoor fan.
• Check for defect in outdoor fan
motor.
• Check outdoor PMVs (PMV1, 4)
for clogging.
• Check indoor/outdoor heat
exchangers for clogging.
• Check for short-circuiting of
outdoor suction/discharge air
flows.
• Check SV2 circuit for clogging.
• Check for defect in outdoor P.C.
board (I/F).
• Check for trouble in indoor fan
system (possible cause of air
flow reduction).
• Check opening status of indoor
PMV.
• Check indoor-outdoor
communication line for wiring
trouble.
• Check for faulty operation of
check valve in discharge pipe
convergent section.
• Check gas balancing SV4 valve
circuit.
• Check SV5 valve circuit.
• Check for refrigerant
overcharging.
P13
P13
—
I/F
Outdoor liquid
backflow
detection
trouble
All stop
<During cooling operation>
When system is in cooling
operation, high pressure is
detected in follower unit that has
been turned off.
<During heating operation>
When system is in heating
operation, outdoor PMV 1 or 3
continuously registers opening of
300p or less while under superheat
control.
• Check full-close operation of
outdoor PMV (1, 3, 4).
• Check for defect in Pd or Ps
sensor.
• Check gas balancing circuit (SV2)
for clogging.
• Check balance pipe.
• Check SV3B circuit for clogging.
• Check defect in outdoor P.C.
board (I/F).
• Check capillary of oil separator oil
return circuit for clogging.
• Check for leakage of check valve
in discharge pipe convergent
section.
MG-CTT: Magnet contactor
P07
P07
01: Compressor 1 side
02: Compressor 2 side
IPDU
I/F
Heat sink
overheating
trouble
All stop
Temperature sensor built into IPM
(TH) is overheated.
• Check power supply voltage.
• Check outdoor fan system
trouble.
• Check heat sink cooling duct for
clogging.
• Check IPM and heat sink for
thermal performance for faulty
installation.
(e.g. mounting screws and
thermal conductivity)
• Check for defect in A3-IPDU.
(faulty IPM built-in temperature
sensor (TH))
P05
P05
00:
I/F
Detection of
open phase/
phase
sequence
01: Compressor 1 side
02: Compressor 2 side
Inverter DC
voltage (Vdc)
trouble
(compressor)
MG-CTT trouble
All stop
• Open phase is detected when
power is turned on.
• Inverter DC voltage is too high
(overvoltage) or too low
(undervoltage).
• Check for defect in outdoor P.C.
board (I/F).
• Check wiring of outdoor power
supply.
Outdoor 7-segment display
Check
code
Sub-code
Location
of
detection
Description
System status
Trouble detection
condition(s)
Check items (locations)
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