Toshiba MMD-AP0721HP-UL1 Service Manual page 64

Check code
Outdoor 7-segment display
Main
remote
Check
control Sub-code
code
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 –
H06 H06 –
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
System
of Description
status
detection
Indoor Other indoor Stop of
trouble
unit 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)
I/F Activation of All stop
low-pressure
protection
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Trouble detection
Check items (locations)
condition(s)
Indoor P.C. board does not • Check for defect in indoor P.C.
operate normally. board (faulty EEPROM)
Outdoor P.C. board (I/F) • Check power supply voltage.
does not operate normally. • Check power supply noise.
• Check for defect in outdoor
P.C. board (I/F).
Inverter current detection • Check power supply voltage.
circuit detects overcurrent (AC460V ± 10%).
and shuts system down. • 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
Overcurrent is detected
several seconds after compressor.
startup of inverter • Check power supply voltage.
compressor. (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.
Current flow of at least • Check current detection circuit
specified magnitude is wiring.
detected despite inverter • Check defect in outdoor P.C.
compressor having been board (A3-IPDU).
shut turned off.
Discharge temperature of • Check installation of TD1
compressor 1 (TD1) does sensor.
not increase despite • Check connection of TD1
compressor being in sensor connector and wiring.
operation. • Check resistance
characteristics of TD1 sensor.
• Check for defect in outdoor
P.C. board (I/F).
Low-pressure Ps sensor • Check service valves to
detects operating confirm full opening
pressure lower than (both gas and liquid sides).
2.9psi(0.02MPa)
• Check outdoor PMVs for
clogging (PMV1, 3).
• Check for defect in SV2 or SV4
circuits.
• Check for defect in low-
pressure Ps sensor.
• Check indoor filter for clogging.
• Check valve opening status of
indoor PMV.
• Check refrigerant piping for
clogging.
• Check operation of outdoor fan
(during heating).
• Check for insufficiency in
refrigerant quantity.
MG-CTT: Magnet contactor