Toshiba MMC-AP0154H-E(-TR) Service Manual Download

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Check code

Location

detection

Description

System status

Error detection

condition(s)

Check items (locations)

Outdoor 7-segment display

Check

code

Sub-code

Main

remote

controller

P03

—

P03

I/F

Discharge
temperature TD1
error

All stop

Discharge temperature (TD1)
exceeds 115 ˚C.

• Check outdoor service valves (gas
side, liquid side) to confirm full
opening.
• Check outdoor PMVs (PMV1, 2, 4)
for clogging.
• Check resistance characteristics of
TD1 sensor.
• Check for insufficiency in
refrigerant quantity.
• Check for defect in 4-way valve.
• Check for leakage of SV4 circuit.
• Check SV4 circuit (wiring or
installation error in SV41, SV42 or
SV43).

P04

01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side

P04

IPDU

Activation of high-
pressure SW

All stop

High-pressure SW is activated. • Check connection of highpressure

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

SMMS (Series 1)
01: Open phase
detected
02: Phase
sequence error

P05

I/F

Open phase
detected, Phase
sequence error

All stop

• Phase sequence error was
detected when the power is
turned on.
• Open phase error was
detected when the power is
turned on.

• Check the phase sequence of
outdoor power wiring.
• Check the outdoor PC board (I/F)
error.

P07

01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side

P07

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

Detected indoor
address

P10

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.

MG-CTT: Magnet contactor

SMMS-i
(Series 4)
00:

I/F

Detection of open
phase / phase
sequence

01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side

Inverter DC
voltage (Vdc) error
(compressor)
MG-CTT error

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).