Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 266

2) Model FDC71~250
Remote controller 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 flash-
ing 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.
(iii) Optional controller in-use
SL-1N-E
SL-2N-E Indoor unit control PCB
SL-3N-E
Error code Red LED Red LED
Keeps flashing Stays OFF
Location of trouble
Green
Red LED
LED (1)
Power supply wires
Keeps
1 time flash
flashing
Outdoor unit control PCB
Installation or operating
condition
Outdoor unit heat
Keeps
1 time flash exchanger temperature
flashing
thermistor
Outdoor unit control PCB
Installation or operating
condition
Keeps Discharge pipe temperature
1 time flash
flashing thermistor
Outdoor unit control PCB
Outdoor unit heat
exchanger temperature
Keeps
thermistor
1 time flash
flashing
Outdoor unit control PCB
Ambient air temperature
thermistor
Keeps
1 time flash
flashing
Outdoor unit control PCB
Discharge pipe temperature
thermistor
Keeps
1 time flash
flashing
Outdoor unit control PCB
Installation or operating
Keeps
condition
1 time flash
flashing
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective 63H input circuit)?
Keeps
1 time flash Inverter PCB or radiator fin • Power transistor overheat (Model 200, 250 only)
flashing
Outdoor unit control PCB
compressor
Keeps
1 time flash
flashing
Installation or operating
condition
Outdoor unit control PCB • Anomalous outdoor unit control PCB communication
Keeps
1 time flash
flashing
Inverter PCB
Outdoor unit DC fan motor • Anomalous outdoor unit DC fan motor
Keeps
1 time flash
flashing
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective DC motor input circuit)?
Installation or operating
condition
Keeps
1 time flash Low pressure sensor
flashing
Outdoor unit control PCB *• Defective outdoor unit control PCB (Defective sensor input circuit)?
Keeps
1 time flash Inverter PCB
flashing
Suction pipe temperature
thermistor
Keeps
1 time flash
flashing
Outdoor unit control PCB *• Defective outdoor unit PCB (Defective thermistor input circuit)?
Low pressure sensor
Keeps
1 time flash
flashing
Outdoor unit control PCB • Defective outdoor unit control PCB (Defective sensor input circuit)?
Compressor underneath
temperature thermistor
Keeps
1 time flash
flashing
Outdoor unit control PCB
Operation status
Keeps
1 time flash
flashing
Installation status
5 times Keeps
Compressor inverter PCB • Anomalous compressor startup
flash flashing
Keeps
1 time flash Compressor
flashing
Outdoor unit control PCB
Green LED Red LED Green LED
Keeps flashing Stays OFF Keeps flashing
Description of trouble
• Outdoor unit power supply L3-phase interruption, defective noise filter
(3-phase model only)
*• Defective outdoor unit control PCB (Defective power supply input circuit)?
(3-phase model only)
• Higher outdoor unit heat exchanger temperature
• Defective outdoor unit heat exchanger temperature thermistor
*• Defective outdoor unit control PCB (Defective temperature thermistor input
circuit)?
• Higher discharge temperature
• Defective discharge pipe temperature thermistor
*• Defective outdoor unit control PCB (Defective temperature thermistor input
circuit)?
• Defective outdoor unit heat exchanger temperature thermistor, broken wire or
poor connector connection
*• Defective outdoor unit control PCB (Defective temperature thermistor input
circuit)?
• Defective ambient air temperature thermistor, broken wire or poor connector
connection
*• Defective outdoor unit control PCB (Defective temperature thermistor input
circuit)?
• Defective discharge pipe temperature thermistor, broken wire or poor
connector connection
*• Defective outdoor unit control PCB (Defective temperature thermistor input
circuit)?
• Rising high pressure (Operation of 63H1) • Service valve closing operation
• Current cut (Anomalous compressor over-current)
• Service valve closing operation
• Anomalous inverter PCB communication
• 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 thermistor, broken wire or poor connector
connection
• Defective low pressure sensor
• Defective compressor underneath temperature thermistor (Model 200, 250
only)
• Defective outdoor unit control PCB (Defective thermistor input circuit)?
(Model 200, 250 only)
• Shortage in refrigerant quantity
• Service valve closing operation
• Anomalous compressor rotor position detection (Model 200, 250 only)
Location of
trouble
SL-1N-E
• Communication error (Defective communication circuit on the main unit of SL1N-E, SL2N-E or
SL-2N-E
SL3N-E)
SL-3N-E
249
– –
Repair method
Repair
Replacement of PCB
Repair
Replacement of
temperature thermistor
Replacement of PCB
Repair
Replacement, repair of
temperature thermistor
Replacement of PCB
Replacement, repair of
temperature thermistor
Replacement of PCB
Replacement, repair of
temperature thermistor
Replacement of PCB
Replacement, repair of
temperature thermistor
Replacement of PCB
Repair
Replacement of PCB
Replacement of PCB
or Repair
Replacement of PCB
Repair
Service valve opening
check
Replacement of PCB
Replacement, repair
Replacement of PCB
Repair
Replacement, repair of
sensor
Replacement of control
PCB
Replacement of PCB
Replacement, repair of
temperature thermistor
Replacement of control
PCB
Replacement of sensor
Replacement of control
PCB
Replacement of
temperature thermistor
Replacement of control
PCB
Repair
Service valve opening
check
Replacement
Replacement
Description of trouble
Reference
page
297, 298
300
301
302
303
304
305
306
307, 308
309
312
313, 314
315
316
317
318
319
321
322
Repair method
Replacement