Mitsubishi Heavy Industries FDT Series Technical Manual page 335

2) FDC71 140
a) FDT, FDTC, FDEN, FDU, FDUM, FDF series
Remote controller 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) * mark 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 control PCB Outdoor inventer PCB
Green
Yellow
Red LED
LED
LED (1)
Keeps
1 time flash
flashing
Keeps
1 time flash
flashing
Keeps
Keeps
1 time flash
flashing
flashing
Keeps
1 time flash
flashing
Keeps
1 time flash
flashing
Keeps
1 time flash
flashing
Keeps
1 time flash 6 times flash
flashing
Keeps
1 time flash 1 time flash
flashing
Keeps Keeps
1 time flash
flashing flashing
Keeps
1 time flash 7 times flash
flashing
Keeps
1 time flash
flashing
Keeps
flashing
Keeps
1 time flash
flashing
Keeps
1 time flash 6 times flash
flashing
Keeps
1 time flash
flashing
Keeps
Keeps
1 time flash
flashing
flashing
Keeps
1 time flash
flashing
5 times Keeps
Stays OFF
flash flashing
Location of trouble
Installation or operating
• Higher outdoor heat exchanger temperature
condition
Outdoor heat exchanger
• Defective outdoor heat exchanger temperature thermistor
temperature thermistor
*• Defective outdoor control PCB (Defective temperature thermistor input
Outdoor control PCB
circuit)?
Installation or operating
• Higher discharge temperature
condition
Discharge pipe
• Defective discharge pipe temperature thermistor
temperature thermistor
*• Defective outdoor control PCB (Defective temperature thermistor input
Outdoor control PCB
circuit)?
Outdoor heat exchanger • Defective outdoor heat exchanger temperature thermistor, broken wire or poor
temperature thermistor connector connection
*• Defective outdoor control PCB (Defective temperature thermistor input
Outdoor control PCB
circuit)?
Outdoor air temperature • Defective Outdoor air temperature thermistor, broken wire or poor connector
thermistor connection
*• Defective outdoor control PCB (Defective temperature thermistor input
Outdoor control PCB
circuit)?
Discharge pipe • Defective discharge pipe temperature thermistor, broken wire or poor
temperature thermistor connector connection
*• Defective outdoor control PCB (Defective temperature thermistor input
Outdoor control PCB
circuit)?
Installation or operating
• Rising high pressure (Operation of 63H1) • Service valve closing operation
condition
Outdoor control PCB *• Defective outdoor control PCB (Defective 63H input circuit)?
Inverter PCB or radiator
• Power transistor overheat
fin
Outdoor control PCB
• Current cut (Anomalous compressor over-current)
compressor
Installation or operating
• Service valve closing operation
condition
Outdoor control PCB • Anomalous outdoor control PCB communication
Inverter PCB • Anomalous inverter PCB communication
Inverter PCB • Defective outdoor inverter PCB (Model FDC 71 only)
activefilter Defective active filter of control.
Outdoor fan motor • Anomalous outdoor fan motor
Outdoor control PCB *• Defective outdoor control PCB (Defective motor input circuit)?
Installation or operating
• Low pressure error • Service valve closing operation
condition
• Anomalous low pressure, broken wire of low pressure sensor or poor
Low pressure sensor
connector connection
Outdoor control PCB *• Defective outdoor control PCB (Defective sensor input circuit)?
Inverter PCB • Anomalous inverter PCB
Suction pipe • Defective suction pipe temperature thermistor, broken wire or poor connector
temperature thermistor connection
Outdoor control PCB *• Defective outdoor PCB (Defective thermistor input circuit)?
Low pressure sensor • Defective low pressure sensor
Outdoor control PCB • Defective outdoor control PCB (Defective sensor input circuit)?
Operation status • Shortage in refrigerant quantity
Installation status • Service valve closing operation
Compressor inverter
• Anomalous compressor startup
PCB
- 334 -
'12 • PAC-T-173
Description of trouble
Reference
Repair method
page
Repair
Replacement of
398
temperature thermistor
Replacement of PCB
Repair
Replacement, repair of
399
temperature thermistor
Replacement of PCB
Replacement, repair of
temperature thermistor
400
Replacement of PCB
Replacement, repair of
temperature thermistor
401
Replacement of PCB
Replacement, repair of
temperature thermistor
402
Replacement of PCB
Repair
403
Replacement of PCB
Replacement of PCB
404
or Repair
Replacement of PCB
405•406
Repair
Replacement of PCB 407
Replacement 409
Replacement, repair
411
Replacement of PCB
Repair
Replacement, repair of
412•413
sensor
Replacement of control
PCB
Replacement of PCB 415
Replacement, repair of
temperature thermistor
416
Replacement of control
PCB
Replacement of sensor
417
Replacement of control
PCB
Repair
419
Service valve opening
check
Replacement 422•423