Mitsubishi Heavy Industries SRK20ZJX-S Service Manual page 65

(ii) Outdoor unit
Remote controller Indoor control PCB
Green
Error code Red LED Red LED
LED
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
Stays OFF
flashing
Keeps
flashing
Keeps
Stays OFF
flashing
Keeps
Stay 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
main PCB
Location of trouble
Red LED
Installation, operation status • Higher outdoor heat exchanger temperature
Outdoor heat exchanger
2 times
• Defective outdoor heat exchanger temperature sensor
temperature sensor
flash
Outdoor main PCB *• Defective outdoor main PCB (Defective temperature sensor input circuit)?
Installation, operation status • Higher discharge temperature
Discharge pipe temperature
5 times
• Defective discharge pipe temperature sensor
sensor
flash
Outdoor main PCB *• Defective outdoor main PCB (Defective temperature sensor input circuit)?
Outdoor heat exchanger • Defective outdoor heat exchanger temperature sensor, broken wire or poor
8 times temperature sensor connector connection
flash
Outdoor main PCB *• Defective outdoor main PCB (Defective temperature sensor input circuit)?
Outdoor air temperature • Defective outdoor air temperature sensor, broken wire or poor connector
8 times sensor connection
flash
Outdoor main PCB *• Defective outdoor main PCB (Defective temperature sensor input circuit)?
Discharge pipe temperature • Defective discharge pipe temperature sensor, broken wire or poor connector
8 times sensor connection
flash
Outdoor main PCB *• Defective outdoor main PCB (Defective temperature sensor input circuit)?
Outdoor main PCB,
• Current cut (Anomalous compressor over-current)
1 time
compressor
flash
Installation, operation status • Service valve closing operation
Outdoor main PCB • Anomalous outdoor main PCB commuication
4 times
flash
Outdoor sub PCB • Anomalous outdoor sub PCB commuication
2 times
Outdoor sub PCB • Defective active filter
flash
Fan motor • Defective fan motor
Keeps
flashing
Outdoor main PCB • Defective outdoor main PCB
1 time Power transistor error
• Power transistor error
flash (outdoor main PCB)
• Defective suction pipe temperature sensor, broken wire or poor connector
Outdoor suction pipe sensor
8 times connection
flash
Outdoor sub PCB • Defective outdoor sub PCB (Defective temperature sensor input circuit)?
Operation status • Shortage in refrigerant quantity
2 times
flash
Installation status • Service valve closing operation
• Overload operation
3 times
• Overcharge • Current safe stop
flash
• Compressor locking
2 times Compressor, outdoor main
• Anomalous compressor startup
flash PCB
7 times
Compressor • Anomalous compressor rotor lock
flash
-
Description of trouble
64
-
'10 • SCM-SM-094
Reference
Repair method
page
Repair
Replacement, repair
of temperature
100
sensor
Replacement of
PCB
Repair
Replacement, repair
of temperature
101
sensor
Replacement of
PCB
Replacement, repair
of temperature
sensor 102
Replacement of
PCB
Replacement, repair
of temperature
sensor 103
Replacement of
PCB
Replacement, repair
of temperature
sensor 104
Replacement of
PCB
Replacement of
PCB
105 106
Repair
Replacement of
107
PCB
Repair
108
PCB replacement
Replacement 109
Replacement of
110
PCB
Replacement, repair
of temperature
sensor 111
Replacement of
PCB
Repair
112
Service valve
opening check
Replacement 113
Replacement 114
Replacement 115