Mitsubishi Heavy Industries FDT Series Technical Manual page 336

b) SRK series
Remote controller Indoor unit display
TIMER
Error code Red LED RUN light
light
Keeps
ON
flashing
5 times
ON
flash
Keeps 2 times
flashing flash
Keeps
1 time flash
flashing
Keeps 4 times
flashing flash
• • • •
• • • •
Keeps
flashing
ON 1 time flash
• • • •
7 times
ON
flash
• • • •
4 times
ON
flash
Keeps 4 times
flashing flash
• • • •
7 times
ON
flash
• • • •
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
1) FDT, FDTC, FDEN, FDU, FDUM, FDF series
Indoor unit control PCB
Error code Red LED Red LED
Keeps flashing Stays OFF Keeps flashing
2) SRK series
Indoor unit display panel
Error code Red LED RUN light TIMER light
Keeps flashing
Outdoor control PCB Outdoor inventer PCB
Red LED Green LED Yellow LED
Keeps
1 time flash
flashing
Keeps
1 time flash
flashing
Keeps
Keeps
flashing
1 time flash
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
1 time 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
Outdoor unit control PCB
Green LED Red LED Green LED
Stays OFF Keeps flashing • Communication error (Defective communication circuit on the main unit of SC-SL2N-E or SC-SL3N-E) ete.
Outdoor unit control PCB
Red LED Green LED
Stays OFF Keeps flashing • Communication error (Defective communication circuit on the main unit of SC-SL2N-E or SC-SL3N-E) ete.
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
temperature thermistor • Defective discharge pipe temperature thermistor
*• Discharge pipe 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
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,
•Anomalous compressor startup
inverter PCB
Description of trouble
Description of trouble
- 335 -
'12 • PAC-T-173
Description of trouble
Reference
Repair method
page
Repair
Replacement of
449
temperature thermistor
Replacement of PCB
Repair
Replacement, repair of
450
temperature thermistor
Replacement of PCB
Replacement, repair of
temperature thermistor
451
Replacement of PCB
Replacement, repair of
temperature thermistor
452
Replacement of PCB
Replacement, repair of
temperature thermistor
453
Replacement of PCB
Repair
454
Replacement of PCB
Replacement of PCB
455
or Repair
Replacement of PCB
456 457
Repair
458
Replacement of PCB
Replacement, repair
459
Replacement of PCB
Repair
Replacement, repair of
460 461
sensor
Replacement of control
PCB
Replacement of PCB 462
Replacement, repair of
temperature thermistor
463
Replacement of control
PCB
Replacement of sensor
464
Replacement of control
PCB
Repair
465
Service valve opening
check
Replacement 466 467
Repair method
Replacement
Repair method
Replacement