Toshiba MMY-MAP0804HT8-E Service Manual page 184

Outdoor 7-segment display
Main
remote
Check
controller
code
F29 –
F31 F31
H01 H01
H02 H02
H03 H03
H05 H05
H06 H06
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
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Check code
Location
AI-NET central
of
control
detection
remote
Sub-code
controller
Indoor
– 12 unit
I/F
– 1C
01: Compressor 1 IPDU
side
02: Compressor 2
side
1F
03: Compressor 3
side
01: Compressor 1 IPDU
side
02: Compressor 2
side
03: Compressor 3
side
1d
01: Compressor 1 IPDU
side
02: Compressor 2
17
side
03: Compressor 3
side
I/F
–
I/F
– 20
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System Error detection
Description
status
Other indoor Stop of Indoor P.C. board does not
error corresponding operate normally.
unit
Outdoor All stop *1 Outdoor P.C. board (I/F)
EEPROM does not operate normally.
error
Compressor All stop Inverter current detection
breakdown circuit detects overcurrent
and shuts system down.
Compressor All stop Overcurrent is detected
error (lockup) several seconds after
MG-CTT error startup of inverter
compressor.
Current All stop Current flow of at least
detection specified magnitude is
circuit error detected despite inverter
compressor having been
shut turned off.
TD1 sensor All stop Discharge temperature of
miswiring compressor 1 (TD1) does
(incomplete not increase despite
insertion) compressor being in
operation.
Activation of All stop Low-pressure Ps sensor
low-pressure detects operating pressure
protection lower than 0.02MPa.
183
Check items (locations)
condition(s)
• 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.
(AC200V ± 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.
(AC200V ± 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
entrapment 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).
• Check service valves to
confirm full opening
(both gas and liquid sides).
• Check outdoor PMVs for
clogging (PMV1, 2).
• 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