Toshiba Carrier MMU-AP0182H2UL Service Manual page 95

Check code
Outdoor 7-segment display
Main
remote
Check code Sub-code
controller
01
02
03
04
05
06
07
08
L29 L29
09
0A
0B
0C
0D
0E
0F
Symbol O
signifies site of
IPDU error.
Detected indoor
address
L30 L30
– L31
P01 –
P03 P03
Location
of Description
detection
I/F Error in No. of
A3-IPDU Fan
IPDUs
1 2 3 IPDU
O
O
O O
O
O O
O O
O O O
O
O O
O O
O O O
O O
O O O
O O O
O O O O
Indoor External
unit interlock of
indoor unit
I/F Extended IC
–
error
Indoor Indoor fan
– unit motor error
I/F Discharge
temperature
TD1 error
–
Error detection
System status
condition(s)
All stop Insufficient number of IPDUs
are detected when power is
turned on.
Stop of • Signal is present at
corresponding external error input
unit terminal (CN80) for 1
minute.
Continued There is part failure in P.C.
operation board (I/F).
Stop of
corresponding
unit
All stop Discharge temperature (TD1)
exceeds 239°F(115°C)
95
Check items (locations)
• Check model setting of
P.C. board for servicing
outdoor I/F P.C. board.
• Check connection of UART
communication connector.
• Check A3-IPDU, fan IPDU,
and I/F P.C. board for
defect.
When external device is
connected to CN80
connector:
1) Check for defect in
external device.
2) Check for defect in indoor
P.C. board.
When external device is not
connected to CN80
connector:
1) Check for defect in indoor
P.C. board.
Check outdoor P.C. board
(I/F).
• Check the lock of fan motor
(AC fan).
• Check wiring.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check outdoor PMVs
(PMV1, 2, 4) for clogging.
• Check resistance
characteristics of TD1
sensor.
• Check for insufficiency in
refrigerant quantity.
• Check for defect in 4-way
valve.
• Check for leakage of SV4
circuit.
• Check SV4 circuit (wiring
or installation error in
SV41, SV42 or SV43).