Toshiba Carrier MMD- AP0074BH2UL, Service Manual

Page: 66 / 94

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MG-CTT: Magnet contactor
Check code
Location
of
detection
Description
System
status
Error detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check code Sub-code
P04 P04
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
IPDU Activation of high-
pressure SW
All stop High-pressure SW is
activated.
• 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.
P05 P05
00: I/F Detection of open
phase/phase sequence
All stop • Open phase is
detected when
power is turned
on.
• Inverter DC
voltage is too high
(overvoltage) or
too low
(undervoltage).
• Check for defect in outdoor
P.C. board (I/F).
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
Inverter DC voltage
(Vdc) error
(compressor)
MG-CTT error
P07 P07
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
IPDU
I/F
Heat sink overheating
error
All stop Temperature sensor
built into IGBT (TH)
is overheated.
• 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))
P10 P10
Detected indoor
address
Indoor
unit
Indoor overflow error All stop • Float switch
operates.
• Float switch circuit
is open-circuited
or disconnected at
connector.
• 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.
P12 – –
Indoor
unit
Indoor fan motor error Stop of
corresponding
unit
• Motor speed
measurements
continuously
deviate from target
value.
• Overcurrent
protection is
activated.
• 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).
•
In the case of incorrect duct
setting performed at installation
or if an access panel for the
maintenance is removed while
indoor unit is in operation