Toshiba MMY-MUP0961HT6P-UL Service Manual page 191

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
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
P05 P05
1∗: Compressor
1 side
2∗: Compressor
2 side
Location
Description System status
of
detection
Indoor unit Indoor external Stop of
interlock corresponding
(External unit
abnormal input)
I/F Extended IC Continued
trouble operation
Indoor unit Indoor fan Stop of
motor trouble corresponding
unit
I/F Discharge All stop
temperature
TD1 trouble
I/F Activation of All stop
high-pressure
SW
I/F Power detection All stop
trouble / Open
phase detection
All stop
Compressor Compressor
P.C. board Vdc trouble
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Check code detection
Check items (locations)
condition(s)
• Indoor unit has been shut When external device is
down due to external connected:
abnormal input signal. 1) Check for trouble in
2) Check for trouble in
When external device is
not connected:
1) Check for trouble in
There is part failure in P.C. Check outdoor P.C. board
board (I/F). (I/F).
• Check the lock of fan
motor (AC fan).
• Check wiring.
Discharge temperature • Check outdoor service
(TD1) exceeds valves (gas side, liquid
239˚F(115˚C).
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).
High-pressure SW is • Check connection of high-
activated. 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 failure operation
of check valve in discharge
pipe convergent section.
• Check gas balancing SV4
valve circuit.
• Check for refrigerant
overcharging.
• Check for failure in outdoor
• Open phase is detected
when power is turned on. P.C. board (I/F).
• Check wiring of outdoor
power supply.
• Check power supply
voltage.
• Inverter DC voltage is too
high (over voltage) or too
low (under voltage).
external device.
indoor P.C. board.
indoor P.C. board.