Toshiba MMC-AP0188HPUL Service Manual page 67

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
F24 F24
F29
F31 F31
01: Compressor 1
side
02: Compressor 2
side
H01 H01
03: Compressor 3
side
01: Compressor 1
side
02: Compressor 2
side
03: Compressor 3
side
H02 H02
01: Compressor 1
side
02: Compressor 2
H03 H03
side
03: Compressor 3
side
H05 H05
H06 H06
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
Description System status
of
detection
I/F Pd sensor All stop
error
Indoor Other indoor Stop of
unit error corresponding
unit
I/F Outdoor All stop *1
EEPROM
error
IPDU Compressor All stop
breakdown
IPDU Compressor All stop
error (lockup)
MG-CTT error
IPDU Current All stop
detection
circuit error
I/F TD1 sensor All stop
miswiring
(incomplete
insertion)
I/F Activation of All stop
low-pressure
protection
- 67 -
Error detection
Check items (locations)
condition(s)
Output voltage of Pd Check connection of Pd
sensor connector.
sensor is zero (sensor
open-circuited). Check for defect in Pd sensor.
Pd > 4.15 MPa despite Check for defect in outdoor
compressor having been P.C. board (I/F).
turned off.
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.
Check power supply noise.
does not operate normally.
Check for defect in outdoor
P.C. board (I/F).
Inverter current detection Check power supply voltage.
circuit detects overcurrent (380-415V ± 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).
Overcurrent is detected Check for defect in
several seconds after compressor.
startup of inverter Check power supply voltage.
compressor. (380-415V ± 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.
Current flow of at least Check current detection circuit
wiring.
specified magnitude is
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
sensor.
compressor 1 (TD1) does
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
confirm full opening
detects operating pressure
lower than 0.02 MPa. (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