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Check code
Outdoor 7-segment display
Sub-code
P.C.board
Compressor Fan Motor
Compressor Fan Motor
1
2
1
2
1
01
O
11
O
02
O
12
03
O
O
13
O
08
O
18
L29
09
O
O
19
O
0A
O
O
1A
0B
O
O
O
1B
O
10
O
Circle (O): Trouble P.C. board
00
L30 Detected indoor unit No.
P03
–
01: Compressor 1
P04
02: Compressor 2
00: Power detection trouble
01: Open phase
P05
02: Power supply miswiring
1 : Compressor 1 heat sink trouble
2 : Compressor 2 heat sink trouble
P07
04: Heat sink dew condensation
P10 Indoor unit No. detected
P11
–
P13
–
01: TS condition
P15
02: TD condition
P17
–
P19 Outdoor unit No. detected
P20
–
A01
–
A02
–
A04
–
Central
Typical problem site
control or
main remote
controller
display
P.C.board
2
1
2
O
O
O
O
O
Trouble in number of
O
O
P.C. boards
L29
O
O
O
O
O
O
O
O
The number of P.C.
board trouble
Indoor external trouble
(L30)
input (interlock)
Outdoor discharge (TD1)
P03
temperature trouble
Activation of high-pressure
P04
SW
Power detection trouble
/Open phase detection
P05
/Power supply miswiring
detection
Heat sink overheating
trouble
P07
Heat sink dew
condensation trouble
(P10)
Indoor unit overflow
Outdoor heat exchanger
P11
freeze trouble
Outdoor liquid backflow
P13
detection trouble
P15
Gas leak detection
Outdoor discharge (TD2)
P17
temperature trouble
4-way valve reversing
P19
trouble
Activation of high-pressure
P20
protection
Flow switch protective
A01
operation
Water temperature
A02
decrease trouble
Plate type heatexchanger
A04
freezing protective operation
Indoor unit (including Hot Water Module)
Description of problem
There are insufficient number of P.C. board in
inverter box.
When there is much number of an inverter P.C.
board to model setting of an interface P.C. board.
Indoor unit has been shut down for external
trouble input in one refrigerant line (detected by
indoor unit).
Outdoor discharge temperature sensor (TD1) has
detected abnormally high temperature.
High-pressure SW is activated.
Open phase is detected when power is turned on.
Inverter DC voltage is too high (overvoltage) or too
low (undervoltage).
Temperature sensor built into IPM (TH) detects
overheating.
Outdoor liquid temperature sensor (TL2) has
detected abnormally low temperature.
Indoor unit has been shutdown in one refrigerant
line due to detection of overflow (detected by
indoor unit).
Remaining frost on outdoor heat exchanger
has been detected repeatedly.
State of refrigerant cycle circuit indicates liquid
backflow operation.
Outdoor suction temperature sensor (TS1) detects
sustained and repeated high temperatures that
exceed standard value.
Outdoor discharge temperature sensor (TD2)
detects abnormally high temperature.
Abnormality in refrigerating cycle is detected
during heating operation.
High pressure (Pd) sensor detects high pressure
that exceeds standard value.
• Check the pump.
• Check the strainer.
• Check the flow switch.
(Type, directtion of attachment and point of contact)
• Check the water temperature.
• Check the heat insulator of wate pipes.
• Check the line heater.
• Check the PMV coil and PMV.
• Check the 2way valve coil and 2way valve.
– 50 –
MG-CTT: Magnet contactor
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Table of Contents
Troubleshooting
