Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 226

(ii) Outdoor unit
Models SCM71 , 80
Remote control 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-time
• 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-time
• 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-time
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-time 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-time 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-time
flash
Outdoor sub PCB • Anomalous outdoor sub PCB commuication
2-time
Outdoor sub PCB • Defective active filter
flash
Fan motor • Defective fan motor
ON
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-time
connection
flash
Outdoor sub PCB • Defective outdoor sub PCB (Defective temperature sensor input circuit)?
Operation status • Shortage in refrigerant quantity
2-time
flash
Installation status • Service valve closing operation
• Overload operation
3-time
• Overcharge • Current safe stop
flash
• Compressor locking
2-time Compressor, outdoor main
• Anomalous compressor startup
flash PCB
7-time
Compressor • Anomalous compressor rotor lock
flash
-
Description of trouble
225
-
'17 • SCM-T-225
Reference
Repair method
page
Repair
Replacement, repair
of temperature
266
sensor
Replacement of
PCB
Repair
Replacement, repair
of temperature
267
sensor
Replacement of
PCB
Replacement, repair
of temperature
268
sensor
Replacement of
PCB
Replacement, repair
of temperature
sensor 269
Replacement of
PCB
Replacement, repair
of temperature
sensor 270
Replacement of
PCB
Replacement of
PCB
271 • 272
Repair
Replacement of
273
PCB
Repair
274
PCB replacement
Replacement 275
Replacement of
276
PCB
Replacement, repair
of temperature
277
sensor
Replacement of
PCB
Repair
278
Service valve
opening check
Replacement 279
Replacement 280
Replacement 281