Toshiba MMU-AP0074YH-E Service Manual page 92

Check code
Outdoor 7-segment display
Main
remote
Check
Sub-code
controller
code
SMMS (Series 1)
01: Open phase
detected
02: Phase
sequence error
P05 P05 SMMS-i
(Series 4)
00:
01: Compressor
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
P12 – –
Location
AI-NET central
of Description
control
detection
remote
controller
I/F Open phase detected,
Phase sequence error
I/F Detection of open
phase / phase
sequence
Inverter DC voltage
AF
(Vdc) error
(compressor)
MG-CTT error
IPDU Heat sink overheating
I/F error
1C
Indoor Indoor overflow error
unit
0b
Indoor Indoor fan motor error
unit
11
System Error detection
status condition(s)
All stop • Phase sequence
error was detected
when the power is
turned on.
• Open phase error
was detected
when the power is
turned on.
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.
Stop of • Motor speed
corresponding measurements
unit continuously
deviate from target
value.
• Overcurrent
protection is
activated.
91
Check items (locations)
• Check the phase sequence of
outdoor power wiring.
• Check the outdoor PC board
(I/F) error.
• 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.
• Check connection of fan
connector and wiring.
• Check for defect in fan motor.
• Check for defect in indoor
P.C. board.
• Check impact of outside air
treatment (OA).
MG-CTT: Magnet contactor