Toshiba MMU-UP0051MH-E(TR) Service Manual page 112

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
1∗: Compressor
1 side
2∗: 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
dew
condensation
Location
Description
of
detection
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
Compressor Heat sink
P.C. board overheating
trouble
I/F Heat sink
overheating
trouble
Heat sink dew
condensation
trouble
– 112 –
Check code detection
System status
condition(s)
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).
All stop Temperature sensor built
into IPM (TH) is overheated.
All stop Condensation detection on
heat sink has occurred four
times or more in operation.
Temperature sensor built
into IPM (TH) is overheated.
Check items (locations)
• 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 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
P.C. board (I/F).
• Check wiring of outdoor
power supply.
• Check power supply
voltage.
• Check outdoor fan system
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))
• Check outdoor fan system
trouble.
• Check IPM and heat sink
for thermal performance for
troubled installation.
(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