Mitsubishi Electric FDT125VNVF Technical Manual page 329

Remote controller Indoor control PCB
Green
Error code Red LED Red LED
LED (1)
1(2) time Keeps
flash flashing
Keeps
1time flash
flashing
Keeps
Stays OFF
flashing
Note (1) Normal indicator lamp (Indoor, outdoor units: 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.
(i) Indoor unit
2) SRK series
Remote controller Indoor unit display
Error code Red LED RUN light TIMER light Red LED Green LED
ON Stays OFF
— —
— —
No-indication Stays OFF
2 times
ON
flash
Keeps
Stays OFF
flashing
or
WAIT
— —
INSPECT I/U
— —
6 times
ON
flash
6 times
ON
flash
6 times
ON
flash
Keeps
flashing
1 time flash ON
3 times
ON
flash
— —
3 times Keeps
flash flashing
6 times
ON
flash
— —
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 control PCB
Location of
Green
trouble
Red LED
LED (1)
Fan motor • Indoor fan motor rotation speed anomaly
Keeps
Stays OFF
flashing
Indoor power PCB • Defective indoor power PCB
Keeps Panel switch
Stays OFF • Defective panel switch operation (FDT only)
flashing detection
Remote controller
Keeps
Stays OFF temperature therm- • Broken wire of remote controller temperature thermistor
flashing
istor
Outdoor control PCB
Location of
trouble
Keeps
Stays OFF —
•Normal operation
flashing
2 times Indoor unit power
Stays OFF •Power OFF, broken wire/blown fuse, broken transformer wire
flash supply
Remote controller •Poor connection, breakage of remote controller wire * For wire breaking at power ON, the
wires LED is OFF.
2 times Keeps
flash flashing
Remote controller • Defective remote controller PCB
Indoor room •Defective indoor room temperature sensor(defective element, broken wire, short-
temperature circuit)
Keeps
sensor •Poor contact of temperature sensor connector
Stays OFF
flashing
Indoor control PCB •Defective indoor control PCB (Defective temperature thermistor input
circuit)?
•Limit switch operate
Limit switch,
•Defective limit switch (Poor contact of limit switch connector)
Keeps
air inlet panel
Stays OFF
•Set is defective air inlet panel
flashing
Indoor control PCB •Defective indoor control PCB (Defective limit switch input circuit)?
Indoor-outdoor
units connection • Poor connection, breakage of indoor-outdoor units connection wire
2 times Keeps
wire
flash flashing
Remote controller • Improper setting of master and slave by remote controller
•Poor connection of remote controller signal wire (White)
Remote controller
wires (Noise)
Keeps
•Intrusion of noise in remote controller wire
Stays OFF
flashing
Remote controller
*
• Defective remote controller or indoor control PCB (defective communication circuit)?
indoor control PCB
Indoor-outdoor
•Poor connection of wire between indoor-outdoor units during operation
2 times Keeps
units connection
(disconnection, loose connection)
flash flashing
wire
•Anomalous communication between indoor-outdoor units by noise, etc.
(Noise)
•CPU-runaway on outdoor control PCB
Keeps
Stays OFF
flashing
Outdoor control *
•Occurrence of defective outdoor control PCB on the way of power supply (defective com-
PCB munication circuit)?
Outdoor control
•Defective outdoor control PCB on the way of power supply
PCB
Stays OFF Stays OFF
Fuse
•Blown fuse
Indoor heat •Defective indoor heat exchanger temperature sensor 1 (defective element, broken
exchanger tempera wire, short-circuit)
Keeps
ture sensor 1 • Poor contact of temperature sensor 1 connector
Stays OFF
flashing
Indoor control PCB •Defective indoor control PCB (Defective temperature thermistor input
circuit)?
Indoor heat •Defective indoor heat exchanger temperature sensor 2 (defective element, broken
exchanger tempera wire, short-circuit)
Keeps
ture sensor 2 • Poor contact of temperature sensor 2 connector
Stays OFF
flashing
Indoor control PCB •Defective indoor control PCB (Defective temperature thermistor input
circuit)?
Keeps Number of con-
•When multi-unit control by remote controller is performed, the number of
Stays OFF
flashing nected indoor units
units is over
Indoor unit No. set-
•No master is assigned to slaves.
Keeps
ting
Stays OFF
flashing
Rcmote controller wires •Anomalous remote controller wire connection, broken wire between master and slave units
Fan motor
•Defective fan motor
Keeps
Stays OFF
flashing
Indoor control PCB •Defective indoor control PCB
Remote controller
Keeps
Stays OFF temperature therm- • Broken wire of remote controller temperature thermistor
flashing
istor
Description of trouble
Description of trouble
* For wire breaking at power ON, the LED is OFF
328
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'12 • PAC-T-174
Reference
Repair method
page
Replacement, repair
385
Replacement
Repair 386
Repair 387
Reference
Repair method
page
— —
Repair 417
Repair
418
Replacement of
remote controller
Replacement, repair
of temperature
sensor 419
Replacement of
PCB
Replacement, repair
420
Replacement of
PCB
Repair 421−425
Repair
427
Replacement of
remote controller or
PCB
Repair
Power reset or
Repair
428
Replacement of
PCB
Replacement
Replacement, repair
of temperature
sensor 1
Replacement of
PCB
429
Replacement, repair
of temperature
sensor 2
Replacement of
PCB
Repair 430
Repair 431
Replacement, repair
432
Replacement
Repair 433