Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 137

2) FDC71-140VNX, 100-140VSX
FDC100-140VNA, 100-140VSA
Remote control Indoor 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
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
Outdoor control PCB inventer
PCB
Location of trouble
Green
Yellow
Red LED
LED
LED (1)
Installation or operating
condition
1-time Keeps
Outdoor heat exchanger
flash flashing
temperature sensor
Outdoor control PCB
Installation or operating
condition
Discharge pipe
1-time Keeps
temperature sensor
flash flashing
Outdoor control PCB
Outdoor heat exchanger
Keeps
temperature sensor
1-time Keeps
flashing
flash flashing
Outdoor control PCB
Outdoor air temperature
sensor
1-time Keeps
flash flashing
Outdoor control PCB
Discharge pipe
temperature sensor
1-time Keeps
flash flashing
Outdoor control PCB
Installation or operating
1-time Keeps
condition
flash flashing
Outdoor control PCB
1-time Keeps Inverter PCB or radiator
6-time flash
flash flashing fin
Outdoor control PCB
compressor
1-time Keeps
1-time flash
flash flashing
Installation or operating
condition
Outdoor control PCB
1-time Keeps Keeps
flash flashing flashing
Inverter PCB
Inverter PCB
active filter
1-time Keeps
7-time flash
flash flashing
Outdoor control PCB
active filter
Outdoor fan motor
1-time Keeps
flash flashing
Outdoor control PCB
Installation or operating
Keeps
condition
flashing
1-time Keeps
Low pressure sensor
flash flashing
Outdoor control PCB
1-time Keeps
6-time flash Inverter PCB
flash flashing
Suction pipe
temperature sensor
1-time Keeps
flash flashing
Outdoor control PCB
Low pressure sensor
Keeps
1-time Keeps
flashing
flash flashing
Outdoor control PCB
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 control PCB (Defective temperature sensor input
circuit)?
• Higher discharge temperature
• Defective discharge pipe temperature sensor
*• Defective outdoor control PCB (Defective temperature sensor input
circuit)?
• Defective outdoor heat exchanger temperature sensor, broken wire or poor
connector connection
*• Defective outdoor control PCB (Defective temperature sensor input
circuit)?
• Defective Outdoor air temperature sensor, broken wire or poor connector
connection
*• Defective outdoor control PCB (Defective temperature sensor input
circuit)?
• Defective discharge pipe temperature sensor, broken wire or poor connector
connection
*• Defective outdoor control PCB (Defective temperature sensor input
circuit)?
• Rising high pressure (Operation of 63H1) • Service valve closing operation
*• Defective outdoor control PCB (Defective 63H input circuit)?
• Power transistor overheat
• Current cut (Anomalous compressor over-current)
• Service valve closing operation
• Anomalous outdoor control PCB communication
• Anomalous inverter PCB communication
• Defective inverter PCB (Model FDC 71 only)
Defective active filter of control.
• Defective outdoor control PCB (Models FDC100-140VNA only)
Defective active filter of control.
• Anomalous outdoor fan motor
*• Defective outdoor control PCB (Defective motor input circuit)?
• Low pressure error • Service valve closing operation
• Anomalous low pressure, broken wire of low pressure sensor or poor
connector connection
*• Defective outdoor control PCB (Defective sensor input circuit)?
• Anomalous inverter PCB
• Defective suction pipe temperature sensor, broken wire or poor connector
connection
*• Defective outdoor PCB (Defective sensor input circuit)?
• Defective low pressure sensor
• Defective outdoor control PCB (Defective sensor input circuit)?
• Shortage in refrigerant quantity
• Service valve closing operation
• Anomalous compressor startup
136
-
'19 • PAC-T-327
Reference
Repair method
page
Repair
Replacement of
216
temperature sensor
Replacement of PCB
Repair
Replacement, repair of
217
temperature sensor
Replacement of PCB
Replacement, repair of
temperature sensor
218
Replacement of PCB
Replacement, repair of
temperature sensor
219
Replacement of PCB
Replacement, repair of
temperature sensor
220
Replacement of PCB
Repair
222
Replacement of PCB
Replacement of PCB
223
or Repair
Replacement of PCB
225•226
Repair
Replacement of PCB 227
Replacement 229
Replacement of PCB 230
Replacement, repair
232•233
Replacement of PCB
Repair
Replacement, repair of
234•235
sensor
Replacement of control
PCB
Replacement of PCB 237
Replacement, repair of
temperature sensor
239
Replacement of control
PCB
Replacement of sensor
240
Replacement of control
PCB
Repair
243
Service valve opening
check
Replacement 246-249