Mitsubishi Electric SRK100VNPZJX, Technical Manual

Page: 329 / 509

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