Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 136

(ii) Outdoor unit
1) SRC40-60ZSX-S
Remote control Indoor control PCB
Error code Red LED Red LED
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Keeps
Stays OFF
flashing
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
Stays OFF
or
WAIT
Stays OFF
INSPECT I/U
Note s (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.
Location of trouble
Green LED
Installation, operation status • Higher outdoor heat exchanger temperature
Outdoor heat exchanger
• Defective outdoor heat exchanger temperature sensor
Keeps flashing
temperature sensor
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
Installation, operation status • Higher discharge temperature
Discharge pipe temperature
• Defective discharge pipe temperature sensor
Keeps flashing
sensor
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
Outdoor heat exchanger • Defective outdoor heat exchanger temperature sensor, broken wire or poor
temperature sensor
Keeps flashing
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
Outdoor air temperature • Defective outdoor air temperature sensor, broken wire or poor connector
sensor
Keeps flashing
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
Discharge pipe temperature • Defective discharge pipe temperature sensor, broken wire or poor connector
sensor
Keeps flashing
*• Defective outdoor control PCB (Defective temperature sensor input
Outdoor control PCB
Keeps flashing Installation, operation status • Service valve (gas side) closing operation
Outdoor control PCB,
• Current cut (Anomalous compressor over-current)
compressor
Keeps flashing
Installation, operation status • Service valve closing operation
Keeps flashing Outdoor control PCB • Defective active filter
Outdoor fan motor • Defective outdoor fan motor
Keeps flashing
Outdoor control PCB • Defective outdoor control PCB
Power transistor error
Keeps flashing • Power transistor error
(outdoor control PCB)
Operation status • Shortage in refrigerant quantity
Keeps flashing
Installation status • Service valve closing operation
• Overload operation
Keeps flashing • Overcharge • Current safe stop
• Compressor locking
Compressor, outdoor control
Keeps flashing • Anomalous compressor startup
PCB
Keeps flashing Compressor • Anomalous compressor rotor lock
Indoor-outdoor
Keep flashing • Poor connection, breakage of indoor-outdoor unit connection wire
connection wire
-
Description of trouble
circuit)?
circuit)?
connector connection
circuit)?
connection
circuit)?
connection
circuit)?
135
-
'19 • PAC-T-327
Reference
Repair method
page
Repair
Replacement, repair
of temperature
215
sensor
Replacement of
PCB
Repair
Replacement, repair
of temperature
217
sensor
Replacement of
PCB
Replacement, repair
of temperature
sensor 218
Replacement of
PCB
Replacement, repair
of temperature
sensor 219
Replacement of
PCB
Replacement, repair
of temperature
sensor 220
Replacement of
PCB
Replacement 221
Replacement of
PCB
225•226
Repair
Repair
228
PCB replacement
Replacement 231
Replacement of
236
PCB
Repair
242
Service valve
opening check
Replacement 244
Replacement 245
Replacement 252
Repair —