Toshiba MMW-AP0481CHQ-E Service Manual page 61

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
01: Compressor 1 side
02: Compressor 2 side
P04 P04
00:
P05 P05 01: Compressor 1 side
02: Compressor 2 side
01: Compressor 1 side
02: Compressor 2 side
P07 P07
Detected indoor
address
P10 P10
P12 — —
Location
Description
of
detection
IPDU Activation of high-
pressure SW
I/F Detection of open
phase/phase
sequence
Inverter DC
voltage (Vdc)
trouble
(compressor)
MG-CTT trouble
IPDU Heat sink
I/F overheating
trouble
Indoor unit Indoor overflow
trouble
Indoor unit Indoor fan motor
trouble
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 • 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.
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Check items (locations)
• Check connection of high pressure
SW connector.
• Check for trouble in PD pressure
sensor.
• Check outdoor service valves (gas
side, liquid side) to confirm full
opening.
• Check for trouble in outdoor fan.
• Check for trouble in outdoor fan
motor.
• Check outdoor PMVs (PMV1, 4)
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 trouble 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 trouble 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 trouble in outdoor P.C.
board (I/F).
• Check wiring of outdoor power
supply.
• Check power supply voltage.
• Check outdoor fan system trouble.
• Check heat sink cooling duct for
clogging.
• Check IPM and heat sink for
thermal performance for trouble
installation.
(e.g. mounting screws and thermal
conductivity)
• Check for trouble in A3-IPDU.
(trouble IPM 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 trouble in indoor P.C.
board.
• Check connection of fan connector
and wiring.
• Check for trouble in fan motor.
• Check for trouble in indoor P.C.
board.
• Check impact of outside air
treatment (OA).
MG-CTT: Magnet contactor