Mitsubishi FDT100VNXWVH Service Manual page 54

(ii) Outdoor unit
1) FDT, FDTC, FDU, FDUM, FDE series
FDC100-140VNX-W, 100-140VSX-W
Remote control Indoor unit control PCB Outdoor unit control PCB
Green
Error code Red LED Red LED
LED (1)
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Note (1) * m ark in the description of trouble means that, in ordinary diagnosis, it cannot identify the cause definitely, and, if the trouble is repaired by replacing the
part, it is judged consequently that the replaced part was defective.
Outdoor
inventer
PCB
Location of trouble
Green Yellow
Red LED
LED (1) LED
Installation or operating
condition
1-time Keeps
Outdoor heat exchanger
flash flashing
temperature sensor
Outdoor unit control PCB
Installation or operating
condition
Discharge pipe
1-time Keeps
temperature sensor
flash flashing
Outdoor unit control PCB
Outdoor heat exchanger
Keeps
temperature sensor
1-time Keeps
flashing
flash flashing
Outdoor unit control PCB
Outdoor air temperature
sensor
1-time Keeps
flash flashing
Outdoor unit control PCB
Discharge pipe
temperature sensor
1-time Keeps
flash flashing
Outdoor unit control PCB
Installation or operating
1-time Keeps
condition
flash flashing
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective 63H input circuit)?
1-time Keeps Inverter PCB or radiator
6-time flash
flash flashing fin
Outdoor unit control
PCB compressor
1-time Keeps
1-time flash
flash flashing
Installation or operating
condition
Outdoor unit control PCB • Anomalous outdoor unit control PCB communication
1-time Keeps Keeps
flash flashing flashing
Inverter PCB
Outdoor fan motor
1-time Keeps
flash flashing
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective motor input circuit)?
Installation or operating
Keeps
condition
flashing
1-time Keeps
Low pressure sensor
flash flashing
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective sensor input circuit)?
1-time Keeps
6-time flash Inverter PCB
flash flashing
Suction pipe
temperature sensor
1-time Keeps
flash flashing
Outdoor unit control PCB *• Defective outdoor unit PCB (Defective sensor input circuit)?
Low pressure sensor
Keeps
1-time Keeps
flashing
flash flashing
Outdoor unit control PCB • Defective outdoor unit control PCB (Defective sensor input circuit)?
Operation status
1-time Keeps
flash flashing
Installation status
5 time Keeps Compressor inverter
Stays OFF
flash flashing PCB
-
Description of trouble
• Higher outdoor heat exchanger temperature
• Defective outdoor heat exchanger temperature sensor
*• Defective outdoor unit control PCB (Defective temperature sensor
input circuit)?
• Higher discharge temperature
• Defective discharge pipe temperature sensor
*• Defective outdoor unit control PCB (Defective temperature sensor
input circuit)?
• Defective outdoor heat exchanger temperature sensor, broken wire or poor
connector connection
*• Defective outdoor unit control PCB (Defective temperature sensor
input circuit)?
• Defective Outdoor air temperature sensor, broken wire or poor connector
connection
*• Defective outdoor unit control PCB (Defective temperature sensor
input circuit)?
• Defective discharge pipe temperature sensor, broken wire or poor connector
connection
*• Defective outdoor unit control PCB (Defective temperature sensor
input circuit)?
• Rising high pressure (Operation of 63H1) • Service valve closing operation
• Power transistor overheat
• Current cut (Anomalous compressor over-current)
• Service valve closing operation
• Anomalous inverter PCB communication
• Anomalous outdoor fan motor
• Low pressure error • Service valve closing operation
• Anomalous low pressure, broken wire of low pressure sensor or poor
connector connection
• Anomalous inverter PCB
• Defective suction pipe temperature sensor, broken wire or poor connector
connection
• Defective low pressure sensor
• Shortage in refrigerant quantity
• Service valve closing operation
• Anomalous compressor startup
53
-
'20 • PAC-SM-351
Reference
Repair method
page
Repair
Replacement of
110
temperature sensor
Replacement of PCB
Repair
Replacement, repair of
111
temperature sensor
Replacement of PCB
Replacement, repair of
temperature sensor
112
Replacement of PCB
Replacement, repair of
temperature sensor
113
Replacement of PCB
Replacement, repair of
temperature sensor
114
Replacement of PCB
Repair
115
Replacement of PCB
Replacement of PCB
116
or Repair
Replacement of PCB
117•118
Repair
Replacement of PCB 119
Replacement, repair
120
Replacement of PCB
Repair
Replacement, repair of
121•122
sensor
Replacement of control
PCB
Replacement of PCB 123
Replacement, repair of
temperature sensor
124
Replacement of control
PCB
Replacement of sensor
125
Replacement of control
PCB
Repair
126
Service valve opening
check
Replacement 127•128