94
Troubleshooting
MG-CTT: Magnet contactor
There are insufficient number of IPDUs (P.C.
boards) in inverter box.
Indoor external error input
(interlock)
Indoor unit has been shut down for external error
input in one refrigerant line (detected by indoor
unit).
–
Outdoor discharge (TD1)
temperature error
Outdoor discharge temperature sensor (TD1) has
detected abnormally high temperature.
P05
00: Open phase detected
Detected indoor unit No.
Open phase/power failure
Open phase is detected when power is turned on.
Inverter DC voltage is too high (overvoltage) or too
low (undervoltage).
01: Compressor 1
02: Compre
ssor 2
Inverter DC voltage (Vdc)
error
MG-CTT error
P07
01: Compressor 1
02: Compressor 2
Indoor unit No. detected
Heat sink overheating
error
Temperature sensor built into
(TH) detects
overheating.
Indoor unit has been shutdown in one refrigerant
line due to detection of overflow (detected by
indoor unit).
–
Outdoor liquid backflow
detection error
State of refrigerant cycle circuit indicates liquid
backflow operation.
P15
P13
P10 (P10)
P07
P05
P03 P03
L30
L29
L29 SIM
SIM
ALT
ALT
ALT
ALT
ALT
ALT Gas leak detection
Indoor unit overflow
ALT
ALT
ALT
Error in number of IPDUs
(L30)
P17
P19
P20
01: TS condition
02: TD condition
Outdoor suction temperature sensor (TS1) detects
sustained and repeated high temperatures that
exceed standard value.
–
Outdoor disc
harge (TD2)
temperature error
Outdoor discharge temperature sensor (TD2)
detects abnormally high temperature.
4-way valve reversing
error
Abnormality in
refrigerating cycle is detected
during heating operation.
–
Activation of high-pressure
protection
High pressure (Pd) sensor detects high pressure
that exceeds standard value.
Check code
Display of receiving unit
Typical problem site Description of problem
Outdoor 7-segment display
TCC-LINK
central control
or main remote
controller
d
isplay
Indicator light block
Sub-code
Flash
Operation
Timer Ready
Circle (O): Faulty IPDU
1 2 1 2 1 2 1 2
01 ○ 10 ○
02 ○ 11 ○ ○
03 ○ ○ 12 ○ ○
08 ○ 13 ○ ○ ○
09 ○ ○ 18 ○ ○
0A ○ ○ 19 ○ ○ ○
0B ○ ○ ○ 1A ○ ○ ○
1B ○ ○ ○ ○
A3-IPDU A3-IPDU Fan-IPDUFan-IPDU
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