Toshiba MMC-UP0151HP-E, Service Manual

Page: 129 / 295

MG-CTT: Magnet contactor
L29 L29 SIM
There are insufficient number of P.C. board in
inverter box. Trouble in number of
P.C. boards
L30 Detected indoor unit No. (L30)
Indoor external trouble
input (interlock)
Indoor unit has been shut down for external
trouble input in one refrigerant line (detected by
indoor unit).
– P03 P03
SIM
ALT
Outdoor discharge (TD1)
temperature trouble Outdoor discharge temperature sensor (TD1) has
detected abnormally high temperature.
P05 P05 ALT
00: Power detection trouble
01: Open phase
02: Power supply miswiring
Power detection trouble
/Open phase detection
/Power supply miswiring
detection
Open phase is detected when power is turned on.
Inverter DC voltage is too high (overvoltage) or too
low (undervoltage).
P07 P07 ALT
1 : Compressor 1 heat sink trouble
2 : Compressor 2 heat sink trouble
04: Heat sink dew condensation
Heat sink overheating
trouble
Heat sink dew
condensation trouble
Temperature sensor built into IPM (TH) detects
overheating.
Outdoor liquid temperature sensor (TL2) has
detected abnormally low temperature.
P10 Indoor unit No. detected (P10) ALT
Indoor unit has been shutdown in one refrigerant
line due to detection of overflow (detected by
indoor unit).
– P13 P13 ALT
Outdoor liquid backflow
detection trouble State of refrigerant cycle circuit indicates liquid
backflow operation.
P15 P15 ALT
01: TS condition
Indoor unit overflow
Gas leak detection
02: TD condition
Outdoor suction temperature sensor (TS1) detects
sustained and repeated high temperatures that
exceed standard value.
– P17
Outdoor discharge (TD2)
temperature trouble Outdoor discharge temperature sensor (TD2)
detects abnormally high temperature.
4-way valve reversing
trouble Abnormality in refrigerating cycle is detected
during heating operation.
– P20
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 Central
control or
main remote
controller
display
Indicator light block
Sub-code
Flash
Operation Timer Ready
P19 Outdoor unit No. detected
P17
P20
P19
ALT
ALT
ALT
– P11 P11 ALT
Outdoor heat exchanger
freeze trouble Remaining frost on outdoor heat exchanger
has been detected repeatedly.
Circle (O): Trouble P.C. board
P.C.board
Compressor Fan Motor
01
02
03
08
09
0A
0B
10
1
O
O
O
O
2
O
O
O
O
1
O
O
O
O
2
O
P.C.board
Compressor Fan Motor
11
12
13
18
19
1A
1B
1
O
O
O
O
2
O
O
O
O
2
O
O
O
O
O
O
O
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