Toshiba MMD-UP0721HFP-UL Service Manual page 76

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 System status
of
detection
I/F Activation of All stop
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 dew
condensation
trouble
- 76 -
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.
times or more in operation. • Check IPM and heat sink
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