Toshiba MML-AP0124H2UL Service Manual page 61

Check code
Main
Outdoor 7-segment display
remote
Check
Sub-code
control
code
01: TS1 sersor trouble
03: TS2 sersor trouble
F12 F12
01: Compressor 1 side
F13 F13
02: Compressor 2 side
F15 F15 —
F16 F16 —
F23 F23 —
F24 F24 —
F29 — —
F31 F31 —
01: Compressor 1 side
02: Compressor 2 side
H01 H01
01: Compressor 1 side
02: Compressor 2 side
H02 H02
01: Compressor 1 side
02: Compressor 2 side
H03 H03
H05 H05 —
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
of
Description System status
detection
I/F TS1/TS2 All stop
sensor trouble
IPDU TH sensor All stop
trouble
I/F Outdoor All stop
temperature
sensor wiring
trouble (TE1,
TL1)
I/F Outdoor All stop
pressure
sensor wiring
trouble (Pd, Ps)
I/F Ps sensor All stop
trouble
I/F Pd sensor All stop
trouble
Indoor Other indoor Stop of
unit trouble corresponding
unit
I/F Outdoor All stop *1
EEPROM
trouble
IPDU Compressor All stop
breakdown
IPDU Compressor All stop
trouble (lockup)
MG-CTT trouble
IPDU Current All stop
detection
circuit trouble
I/F TD1 sensor All stop
miswiring
(incomplete
insertion)
Trouble detection
condition(s)
Sensor resistance is infinity or zero
(open/short circuit).
Sensor resistance is infinity or zero
(open/short circuit).
During compressor operation in
HEAT mode, TL1 continuously
provides temperature reading
higher than indicated by TL1 by at
least specified margin for 3 minutes
or more.
Readings of high-pressure Pd
sensor and lowpressure Ps sensor
are switched.
Output voltages of both sensors
are zero.
Output voltage of Ps sensor is zero. • Check for connection trouble
Output voltage of Pd sensor is zero
(sensor open-circuited).
Pd > 4.15MPa despite compressor
having been turned off.
Indoor P.C. board does not operate
normally.
Outdoor P.C. board (I/F) does not
operate normally.
Inverter current detection circuit
detects overcurrent and shuts
system down.
Overcurrent is detected several
seconds after startup of inverter
compressor.
Current flow of at least specified
magnitude is detected despite
inverter compressor having been
shut turned off.
Discharge temperature of
compressor 1 (TD1) does not
increase despite compressor being
in operation.
– 61 –
Check items (locations)
• Check connection of TS1/TS3
sensor connector.
• Check resistance characteristics
of TS1/TS3 sensor.
• Check for defect.
• Defect in IPM built-in temperature
sensor
Replace A3-IPDU P.C. board.
• Check installation of TE1 and TL1
sensors.
• Check resistance characteristics
of TE1 and TL1 sensors.
• Check for outdoor P.C. board
(I/F) trouble.
• Check connection of highpressure
Pd sensor connector.
• Check connection of lowpressure
Ps sensor connector.
• Check for defect in pressure
sensors Pd and Ps.
• Check for trouble in outdoor P.C.
board (I/F).
• Check for deficiency in
compressive output of
compressor.
involving Ps sensor and Pd
sensor connectors.
• Check connection of Ps sensor
connector.
• Check for defect in Ps sensor.
• Check for deficiency in
compressive output of
compressor.
• Check for defect in 4-way valve.
• Check for defect in outdoor P.C.
board (I/F).
• Check for defect in SV4 circuit.
• Check connection of Pd sensor
connector.
• Check for defect in Pd sensor.
• Check for defect in outdoor P.C.
board (I/F).
• Check for defect in indoor P.C.
board (faulty EEPROM)
• Check power supply voltage.
• Check power supply noise.
• Check for defect in outdoor P.C.
board (I/F).
• Check power supply voltage.
(AC460V ± 10%).
• Check for defect in compressor.
• Check for possible cause of
abnormal overloading.
• Check for defect in outdoor P.C.
board (A3-IPDU).
• Check for defect in compressor.
• Check power supply voltage.
(AC460V ± 10%).
• Check compressor system wiring,
particularly for open phase.
• Check connection of connectors/
terminals on A3-IPDU P.C. board.
• Check conductivity of case heater.
(Check for refrigerant problem
inside compressor.)
• Check for defect in outdoor P.C.
board (A3-IPDU).
• Check outdoor MG-CTT.
• Check current detection circuit
wiring.
• Check defect in outdoor P.C.
board (A3-IPDU).
• Check installation of TD1 sensor.
• Check connection of TD1 sensor
connector and wiring.
• Check resistance characteristics
of TD1 sensor.
• Check for defect in outdoor P.C.
board (I/F).
MG-CTT: Magnet contactor