Toshiba MMU-AP0074YH-E Service Manual page 91

Check code
Outdoor 7-segment display
Main
remote
Check
Sub-code
controller
code
Detected indoor
address
L30 L30
– L31 –
P01 – –
P03 P03 –
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
P04 P04
Location
AI-NET central
of Description
control
detection
remote
controller
Indoor External
unit interlock of
indoor unit
b6
I/F Extended IC
–
error
Indoor Indoor fan motor
11 unit error
I/F Discharge
temperature
TD1 error
1E
IPDU Activation of
high-pressure
SW
21
Error detection
System status
condition(s)
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 115 °C.
All stop High-pressure SW is
activated.
90
Check items (locations)
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).
• Check connection of high-
pressure SW connector.
• Check for defect in Pd
pressure sensor.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check for defect in outdoor
fan.
• Check for defect in outdoor
fan motor.
• Check outdoor PMVs
(PMV1, 2) for clogging.
• Check indoor / outdoor
heat exchangers for
clogging.
• Check for short-circuiting
of outdoor suction /
discharge air flows.
• Check SV2 circuit for
clogging.
• Check for defect in outdoor
P.C. board (I/F).
• Check for error in indoor
fan system (possible cause
of air flow reduction).
• Check opening status of
indoor PMV.
• Check indoor-outdoor
communication line for
wiring error.
• Check for faulty operation
of check valve in discharge
pipe convergent section.
• Check gas balancing SV4
valve circuit.
• Check SV5 valve circuit.
• Check for refrigerant
overcharging.