Toshiba MMW-AP0271LQ-E Service Manual page 56

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
P04 P04
SMMS-i
(Series 4)
00:
01: Compressor
P05 P05
1 side
02: Compressor
2 side
03: Compressor
3 side
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
P07 P07
Detected indoor
address
P10 P10
Location
Description
of
detection
IPDU Activation of
high-pressure
SW
I/F Detection of
open phase /
phase
sequence
Inverter DC
voltage (Vdc)
error
(compressor)
MG-CTT error
IPDU Heat sink
I/F overheating
error
Indoor unit Indoor overflow
error
Error 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 IGBT (TH) is
overheated.
All stop • Float switch operates.
• Float switch circuit is open-
circuited or disconnected
at connector.
– 56 –
Indoor unit (including Hot Water Module)
Check items (locations)
• Check connection of high-
pressure SW connector.
• Check for defect in Pd
pressure sensor.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check for defect in outdoor
fan.
• Check for defect in outdoor
fan motor.
• Check outdoor PMVs
(PMV1, 2) for clogging.
• Check indoor / outdoor
heat exchangers for
clogging.
• Check for short-circuiting
of outdoor suction /
discharge air flows.
• Check SV2 circuit for
clogging.
• Check for defect in outdoor
P.C. board (I/F).
• Check for error in indoor
fan system (possible cause
of air flow reduction).
• Check opening status of
indoor PMV.
• Check indoor-outdoor
communication line for
wiring error.
• Check for faulty operation
of check valve in discharge
pipe convergent section.
• Check gas balancing SV4
valve circuit.
• Check SV5 valve circuit.
• Check for refrigerant
overcharging.
• Check for defect in outdoor
P.C. board (I/F).
• Check power supply
voltage.
• Check outdoor fan system
error.
• Check heat sink cooling
duct for clogging.
• Check IGBT and heat sink
for thermal performance for
faulty installation.
(e.g. mounting screws and
thermal conductivity)
• Check for defect in
A3-IPDU.
(faulty IGBT built-in
temperature sensor (TH))
• Check float switch
connector.
• Check operation of drain
pump.
• Check drain pump circuit.
• Check drain pipe for
clogging.
• Check for defect in indoor
P.C. board.