– 56 –
Check code
Location
of
detection
Description
System status
Error detection
condition(s)
Check items (locations)
• Check power supply
voltage.
• Check outdoor fan system
error.
• Check heat sink cooling
duct for clogging.
• Check IGBT and heat sink
for thermal performance for
faulty installation.
(e.g. mounting screws and
thermal conductivity)
• Check for defect in
A3-IPDU.
(faulty IGBT built-in
temperature sensor (TH))
IPDU
I/F
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
Heat sink
overheating
error
All stop
Temperature sensor built
into IGBT (TH) is
overheated.
P07
P07
• Check float switch
connector.
• Check operation of drain
pump.
• Check drain pump circuit.
• Check drain pipe for
clogging.
• Check for defect in indoor
P.C. board.
Indoor unit
Detected indoor
address
Indoor overflow
error
All stop
• Float switch operates.
• Float switch circuit is open-
circuited or disconnected
at connector.
P10
P10
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
• Check connection of high-
pressure 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, 2) 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 error in indoor
fan system (possible cause
of air flow reduction).
• Check opening status of
indoor PMV.
• Check indoor-outdoor
communication line for
wiring error.
• 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.
IPDU
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
Activation of
high-pressure
SW
All stop
High-pressure SW is
activated.
P04
P04
• Check for defect in outdoor
P.C. board (I/F).
I/F
SMMS-i
(Series 4)
00:
Detection of
open phase /
phase
sequence
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
Inverter DC
voltage (Vdc)
error
(compressor)
MG-CTT error
All stop
• Open phase is detected
when power is turned on.
• Inverter DC voltage is too
high (overvoltage) or too
low (undervoltage).
P05
P05
Indoor unit (including Hot Water Module)