Mitsubishi Heavy Industries FDT90VNPWVH Service Manual page 49

Remote control Indoor unit control PCB
Green
Error code Red LED Red LED
LED (1)
1(2)-time Keeps
flash flashing
Keeps
flashing
Keeps
Stays OFF
flashing
Notes (1) Normal indicator lamp (Indoor unit: Green) extinguishes (or lights continuously) only when CPU is anomalous. It keeps flashing in
any trouble other than anomalous CPU.
(2) * 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.
(ii) Outdoor unit
Remote control Indoor unit 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
Keeps
Stays OFF
flashing
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
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.
Location of trouble
Fan motor • Defective by rotation speed of fan motor
Indoor unit power PCB • Defective indoor unit power PCB
Remote control temperature
• Broken wire of remote control temperature sensor
sensor
Location of trouble
Installation, operation status • Higher outdoor heat exchanger temperature
Outdoor heat exchanger
• Defective outdoor heat exchanger temperature sensor
temperature sensor
Outdoor unit PCB *• Defective outdoor unit PCB (Defective temperature sensor input circuit)?
Installation, operation status • Higher discharge temperature
Discharge pipe temperature
• Defective discharge pipe temperature sensor
sensor
Outdoor unit PCB *• Defective outdoor unit PCB (Defective temperature sensor input circuit)?
Outdoor heat exchanger • Defective outdoor heat exchanger temperature sensor, broken wire or poor
temperature sensor connector connection
Outdoor unit PCB *• Defective outdoor unit PCB (Defective temperature sensor input circuit)?
• Defective outdoor air temperature sensor, broken wire or poor connector
Outdoor air temperature sensor
connection
Outdoor unit PCB *• Defective outdoor unit PCB (Defective temperature sensor input circuit)?
Discharge pipe temperature • Defective discharge pipe temperature sensor, broken wire or poor connector
sensor connection
Outdoor unit PCB *• Defective outdoor unit PCB (Defective temperature sensor input circuit)?
Installation, operation status • Service valve (gas side) closing operation
Outdoor unit PCB, compressor • Current cut (Anomalous compressor over-current)
Installation, operation status • Service valve closing operation
• Over voltage
Outdoor unit PCB
• Defective active filter
Fan motor • Defective fan motor
Outdoor unit PCB • Defective outdoor unit PCB
Power transistor error
• Power transistor error
(Outdoor unit PCB)
Operation status • Shortage in refrigerant quantity
Installation status • Service valve closing operation
• Overload operation
• Overcharge • Current safe stop
• Compressor locking
• Anomalous compressor startup
Compressor, outdoor unit PCB
• Voltage drop
Compressor • Anomalous compressor rotor lock
-
Description of trouble
Description of trouble
48
-
'19 • PAC-SM-334
Reference
Repair method
page
Replacement, repair
92
Replacement
Repair 93
Reference
Repair method
page
Repair
Replacement, repair
of temperature
94
sensor
Replacement of
PCB
Repair
Replacement, repair
of temperature
95
sensor
Replacement of
PCB
Replacement, repair
of temperature
sensor 96
Replacement of
PCB
Replacement, repair
of temperature
sensor 97
Replacement of
PCB
Replacement, repair
of temperature
sensor 98
Replacement of
PCB
Replacement 99
Replacement of
PCB
100・101
Repair
Repair
102
PCB replacement
Replacement 103
Replacement of
104
PCB
Repair
105
Service valve
opening check
Replacement 106
Replacement 107
Replacement 108