Mitsubishi Heavy Industries FDT Series Technical Manual page 334

(ii) Outdoor unit
1) SRC40-60
Remote controller Indoor control PCB
Green
Error code Red LED Red LED
LED
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
Keeps
flashing
part, it is judged consequently that the replaced part was defective.
Outdoor control PCB
Location of trouble
Red LED
Installation, operation status • Higher outdoor heat exchanger temperature
Outdoor heat exchanger
• Defective outdoor heat exchanger temperature sensor
2 times flash
temperature sensor
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
circuit)?
Installation, operation status • Higher discharge temperature
Discharge pipe temperature
• Defective discharge pipe temperature sensor
5 times flash
sensor
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
circuit)?
Outdoor heat exchanger • Defective outdoor heat exchanger temperature sensor, broken wire or poor
temperature sensor connector connection
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
circuit)?
Outdoor air temperature • Defective outdoor air temperature sensor, broken wire or poor connector
sensor connection
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
circuit)?
Discharge pipe temperature • Defective discharge pipe temperature sensor, broken wire or poor connector
sensor connection
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
circuit)?
Outdoor control PCB,
• Current cut (Anomalous compressor over-current)
compressor
1 time flash
Installation, operation status • Service valve closing operation
2 times flash Outdoor control PCB • Defective active filter
• Defective fan motor
Keeps
flashing
Outdoor control PCB • Defective outdoor control PCB
Power transistor error
1 time flash • Power transistor error
(outdoor control PCB)
Operation status • Shortage in refrigerant quantity
2 times flash
Installation status • Service valve closing operation
• Overload operation
3 times flash • Overcharge • Current safe stop
• Compressor locking
Compressor, outdoor control
2 times flash • Anomalous compressor startup
PCB
7 times flash Compressor • Anomalous compressor rotor lock
-
Description of trouble
333 -
'12 • PAC-T-173
Reference
Repair method
page
Repair
Replacement, repair
of temperature
397
sensor
Replacement of
PCB
Repair
Replacement, repair
of temperature
399
sensor
Replacement of
PCB
Replacement, repair
of temperature
sensor 400
Replacement of
PCB
Replacement, repair
of temperature
sensor 401
Replacement of
PCB
Replacement, repair
of temperature
sensor 402
Replacement of
PCB
Replacement of
PCB
405•406
Repair
Repair
PCB replacement
Replacement 410
Replacement of
414
PCB
Repair
Service valve
opening check
Replacement 420
Replacement 421
Replacement 424