Toshiba MMW-UP0271LQ-E Service Manual page 63

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
Detected indoor
address
L30 L30
— L31 —
P01 — —
P03 P03 —
01: Compressor
1 side
02: Compressor
2 side
P04 P04
00: Power
detection
trouble
01: Open phase
02: Power supply
P05 P05
miswiring
1∗: Compressor
1 side
2∗: Compressor
2 side
Location
Description
of
detection
Indoor unit Indoor external
interlock
(External
abnormal input)
I/F Extended IC
trouble
Indoor unit Indoor fan
motor trouble
I/F Discharge
temperature
TD1 trouble
I/F Activation of
high-pressure
SW
I/F Power detection
trouble / Open
phase detection
/ Power supply
miswiring
Compressor Compressor
P.C. board Vdc trouble
Indoor unit (including Hot Water Module)
Check code detection
System status
condition(s)
Stop of • Indoor unit has been shut
corresponding down due to external
unit abnormal input signal.
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.
All stop • Open phase is detected
when power is turned on.
• Inverter DC voltage is too
high (overvoltage) or too
low (undervoltage).
– 63 –
Check items (locations)
When external device is
connected:
1) Check for trouble in
external device.
2) Check for trouble in
indoor P.C. board.
When external device is
not connected:
1) Check for trouble 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, 3, 4) for
clogging.
• Check resistance
characteristics of TD1
sensor.
• Check for insufficiency in
refrigerant quantity.
• Check for failure in 4-way
valve.
• Check for leakage of SV4
circuit.
• Check SV4 circuit (wiring
or installation trouble in
SV41 or SV42).
• Check connection of high-
pressure SW connector.
• Check for failure in Pd
pressure sensor.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check for failure in outdoor
fan.
• Check for failure in outdoor
fan motor.
• Check outdoor PMVs
(PMV1, 2, 3) for clogging.
• Check indoor/outdoor heat
exchangers for clogging.
• Check for short-circuiting of
outdoor suction/discharge
air flows.
• Check for failure in outdoor
P.C. board (I/F).
• Check for trouble in indoor
fan system (possible cause
of air flow reduction).
• Check opening status of
indoor PMV.
• Check indoor-outdoor
communication line for
wiring trouble.
• Check for trouble operation
of check valve in discharge
pipe convergent section.
• Check gas balancing SV4
valve circuit.
• Check for refrigerant
overcharging.
• Check for failure in outdoor
P.C. board (I/F).
• Check wiring of outdoor
power supply.
• Check power supply
voltage.