Toshiba MMU-AP0072H2UL Service Manual page 82

Check code
Outdoor 7-segment display
Sub-code
A3-IPDU Fan A3-IPDU
IPDU
1 2 3 1 2 3
O O
01 0A
O O O
02 0B
O O O
03 0C
O O O
L29 04 0D
O O O O
05 0E
O O O O O
06 0F
O O O
07
Circle (O):
O Faulty IPDU
08
O O
09
L30 Detected indoor unit No.
P03 –
00: Open phase detected
01: Compressor 1
P05
02: Compressor 2
03: Compressor 3
01: Compressor 1
P07 02: Compressor 2
03: Compressor 3
P10 Indoor unit No. detected
P13 –
01: TS condition
P15
02: TD condition
P17 –
P18 –
P19 Outdoor unit No. detected
P20 –
Display of receiving unit
Indicator light block
TCC-LINK
central control
or main remote
Operation Timer Ready
controller
display
Fan
IPDU
O
O
O
O
L29
O
O
(L30)
P03
P05
P07
(P10)
P13
P15
P17
P18
P19
P20
Typical fault site
Flash
There are insufficient number of IPDUs (P.C.
SIM Error in number of IPDUs
boards) in inverter box.
Indoor unit has been shut down for external error
Indoor external error input
SIM input in one refrigerant line (detected by indoor
(interlock)
unit).
Outdoor discharge (TD1) Outdoor discharge temperature sensor (TD1) has
ALT
temperature error detected abnormally high temperature.
Open phase/power failure
Open phase is detected when power is turned on.
Inverter DC voltage (Vdc)
ALT Inverter DC voltage is too high (overvoltage) or too
error
low (undervoltage).
MG-CTT error
Heat sink overheating Temperature sensor built into IGBT (TH) detects
ALT
error overheating.
Indoor unit has been shutdown in one refrigerant
ALT Indoor unit overflow line due to detection of overflow (detected by
indoor unit).
Outdoor liquid backflow State of refrigerant cycle circuit indicates liquid
ALT
detection error backflow operation.
Outdoor suction temperature sensor (TS1) detects
ALT Gas leak detection sustained and repeated high temperatures that
exceed standard value.
Outdoor discharge (TD2) Outdoor discharge temperature sensor (TD2)
ALT
temperature error detects abnormally high temperature.
Outdoor discharge (TD3) Outdoor discharge temperature sensor (TD3)
ALT
temperature error detects abnormally high temperature.
4-way valve reversing Abnormality in refrigerating cycle is detected
ALT
error during heating operation.
Activation of high-pressure High pressure (Pd) sensor detects high pressure
ALT
protection that exceeds standard value.
82
Description of error
MG-CTT: Magnet contactor