Toshiba MMY-MAP0726FT2P-UL - Page 158

Check code
Location
of
detection
Description
System
status
Check code
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
IPDU Activation of high-
pressure SW
All stop High-pressure SW is
activated.
• 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,
3) 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 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
I/F All stop
• Inverter DC
voltage is too high
(overvoltage) or
too low
(undervoltage).
AC power can not
be detected.
01: Compressor 1 side
02: Compressor 2 side
Inverter DC voltage
(Vdc) trouble
(compressor)
AC detection circuit
trouble
P07 P07
01: Compressor 1 side
02: Compressor 2 side
IPDU
I/F
Heat sink
overheating trouble
All stop
Temperature sensor
built into IPM (TH) is
overheated.
• 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 faulty
installation.
(e.g. mounting screws and
thermal conductivity)
• Check for trouble in A3-
IPDU.(faulty IPM built-in
temperature sensor (TH))
P10 P10
Detected indoor address Indoor
unit
Indoor overflow trouble
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 trouble in indoor
P.C. board.
P12 – –
Indoor
unit
Indoor fan motor trouble
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 trouble in fan
motor.
• Check for trouble in indoor
P.C. board.
• Check impact of outside
air treatment (OA).
• Check for trouble in
outdoor
P.C. board (A3-IPDU).
• Check wiring of
outdoor power supply.
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