Toshiba MMY-MUP0801HT8JP Service Manual page 189

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
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
1∗: Compressor
1 side
2∗: Compressor
2 side
01: Compressor
1 heat sink
trouble
02: Compressor
2 heat sink
trouble
P07 P07
04: Heat sink
dewing
Location
Description System status
of
detection
All stop
I/F Activation of
high-pressure
SW
I/F Power detection All stop
trouble / Open
phase detection
/ Power supply
miswiring
Compressor Compressor
P.C. board Vdc trouble
Compressor Heat sink All stop
P.C. board overheating
trouble
I/F Heat sink All stop
overheating
trouble
Heat sink
dewing trouble
- 189 -
Check code detection
Check items (locations)
condition(s)
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.
• Open phase is detected • Check for failure in outdoor
when power is turned on. P.C. board (I/F).
• Inverter DC voltage is too • Check wiring of outdoor
high (overvoltage) or too power supply.
low (undervoltage). • Check power supply
voltage.
Temperature sensor built • Check outdoor fan system
into IPM (TH) is overheated. trouble.
• Check IPM and heat sink for
thermal performance for
failure installation.
(e.g. mounting screws and
thermal conductivity)
• Check for failure in
Compressor P.C. board.
(failure IPM built-in
temperature sensor (TH))
Condensation detection on • Check outdoor fan system
heat sink has occurred four trouble.
• Check IPM and heat sink
times or more in operation.
for thermal performance for
Temperature sensor built
troubled installation.
into IPM (TH) is overheated.
(e. g. mounting screws and
thermal conductivity)
• Check for failure in
compressor P.C. board.
(failure IPM built-in
temperature sensor (TH))
• Check shortage of refrigerant.
• Check outdoor service
valves.
• Check connection of TL2
sensor.
• Check resistance
characteristics of TL2 sensor.
• Check resistance
characteristics of TO sensor.
• Check malfunctions of Pd
and Ps sensors.
• Check outdoor I/F P.C.
board malfunction.
• Check PMV2 and PMV3