Current Safe - Mitsubishi Heavy Industries FDT40ZSXW1VH Service Manual

(ii) Outdoor unit
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
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
Keep
or
WAIT
Stays OFF
INSPECT I/U
flashing
Note (1) * m ark 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.
(iii) Option control in-use
Indoor unit control PCB
Error code Red LED Red LED Green LED
Keeps Keeps
Stays OFF
flashing flashing
Location of trouble
Installation, operation status • Higher outdoor heat exchanger temperature
Outdoor heat exchanger
• Defective outdoor heat exchanger temperature sensor
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
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)?
Installation, operation status • Service valve (gas side) closing operation
Outdoor control PCB,
• Current cut (Anomalous compressor over-current)
compressor
Installation, operation status • Service valve closing operation
Outdoor control PCB • Defective active filter
Fan motor • Defective fan motor
Outdoor control PCB • Defective outdoor control PCB
Power transistor error
• Power transistor error
(outdoor control PCB)
Operation status • Shortage in refrigerant quantity
Installation status • Service valve closing operation
• Overload operation
• Overcharge • Current safe stop
• Compressor locking
Compressor, outdoor control
• Anomalous compressor startup
PCB
Compressor • Anomalous compressor rotor lock
Indoor-outdoor
• Poor connection, breakage of indoor-outdoor unit connection wire
connection wire
Description of trouble
• Communication error (Defective communication circuit on the main unit of SC-SL2NA-E or SC-SL4-AE/BE) ete.
34
-
Description of trouble
-
'19 • PAC-SM-302
Reference
Repair method
page
Repair
Replacement, repair
of temperature
74
sensor
Replacement of
PCB
Repair
Replacement, repair
of temperature
75
sensor
Replacement of
PCB
Replacement, repair
of temperature
76
sensor
Replacement of
PCB
Replacement, repair
of temperature
sensor 77
Replacement of
PCB
Replacement, repair
of temperature
sensor 78
Replacement of
PCB
Replacement 79
Replacement of
PCB
80 •81
Repair
Repair
82
PCB replacement
Replacement 83
Replacement of
84
PCB
Repair
85
Service valve
opening check
Replacement 86
Replacement 87
Replacement 88
Repair —
Repair method
Replacement