Mitsubishi Electric SRK100VNPZJX, Техническое руководство

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'12 • PAC-T-174
1.12 MAINTENANCE DATA
1.12.1 Diagnosing of microcomputer circuit
(1) Selfdiagnosis function
(a) Check Indicator Table
Whether a failure exists or not on the indoor unit and outdoor unit can be know by the contents of remote controller error code,
indoor/outdoor unit green LED (power pilot lamp and microcomputer normality pilot lamp) or red LED (check pilot lamp).
Note (1) SRK series only.
At the indoor unit side, errors are displayed with the combination of RUN light and TIMER light on the display panel.
(i) Indoor unit
1) FDT, FDTC, FDEN, FDU, FDUM, FDF series
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)
No-indication Stays OFF
Stays OFF
Keeps
flashing Stays OFF
Keeps
flashing
—
• Normal operation
— —
Stays OFF Stays OFF
2 times
flash
Stays OFF Indoor unit power
supply
• Power OFF, broken wire/blown fuse, broken transformer wire Repair 366
*
3 times
flash
Keeps
flashing Stays OFF
Keeps
flashing
Remote controller
wires
• Poor connection, breakage of remote controller wire * For wire breaking at power ON, the
LED is OFF.
Repair
367
Remote controller • Defective remote controller PCB
Replacement of
remote controller
WAIT
or
INSPECT I/U
Stays OFF
Keeps
flashing
2 times
flash
Keeps
flashing
Indoor-outdoor
units connection
wire
• Poor connection, breakage of indoor-outdoor units connection wire
Repair 368 - 372
Remote controller • Improper setting of master and slave by remote controller
Keeps
flashing
Stays OFF
*
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
374
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
2 6 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
375
2 times
flash
Keeps
flashing 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
2 times
flash
Keeps
flashing Stays OFF Stays OFF
Outdoor control
PCB
•
Defective outdoor control PCB on the way of power supply
Replacement
Fuse •
Blown fuse
1 time flash
Keeps
flashing Stays OFF
Keeps
flashing
Indoor heat
exchanger tempera-
ture thermistor
•
Defective indoor heat exchanger temperature thermistor
(defective element, bro-
ken wire, short-circuit)
• Poor contact of temperature thermistor connector
Replacement, repair
of temperature
thermistor
376
Indoor control PCB
*
•
Defective indoor control PCB (Defective temperature thermistor input
circuit)?
Replacement of
PCB
1 time flash
Keeps
flashing Stays OFF
Keeps
flashing
Indoor return air
temperature therm-
istor
•
Defective indoor return air temperature thermistor
(defective element, broken wire,
short-circuit)
• Poor contact of temperature thermistor connector
Replacement, repair
of temperature
thermistor
377
Indoor control PCB
*
•
Defective indoor control PCB (Defective temperature thermistor input
circuit)?
Replacement of
PCB
1 time flash
Keeps
flashing Stays OFF
Keeps
flashing
Installation or oper-
ating condition
•
Heating over-load
(Anomalously high indoor heat exchanger temperature) Repair
378
Indoor heat
exchanger tempera-
ture thermistor
•
Defective indoor heat exchanger temperature thermistor (short-circuit)
Replacement of
temperature therm-
istor
Indoor control PCB
*
•
Defective indoor control PCB
(Defective temperature thermistor input circuit)?
Replacement of
PCB
1 time flash
Keeps
flashing Stays OFF
Keeps
flashing
Drain trouble •
Defective drain pump (DM), broken drain pump wire
, disconnected connector
Replacement, repair
of DM
379
Float switch •
Anomalous float switch operation
(malfunction) Repair
Indoor control PCB
*
•
Defective indoor control PCB
(Defective float switch input circuit)
*
•
Defective indoor control PCB
(Defective DM drive output circuit)?
Replacement of
PCB
Option •
Defective optional parts
(At optional anomalous input setting) Repair
Stays OFF
Keeps
flashing 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 380
3 times
flash
Keeps
flashing Stays OFF
Keeps
flashing
Indoor unit No. set-
ting
•No master is assigned to slaves.
Repair 381
Rcmote controller wires •Anomalous remote controller wire connection, broken wire between master and slave units
1(2) time
flash
Keeps
flashing Stays OFF
Keeps
flashing
Fan motor •
Defective fan motor
Replacement, repair
382
Indoor power PCB •
Defective indoor power PCB
Replacement
1 time flash
Keeps
flashing Stays OFF
Keeps
flashing
Address
setting error
• Address setting error of master and slave indoor units Repair 383
1 time flash
Keeps
flashing Stays OFF
Keeps
flashing Indoor control PCB •
Improper operation mode setting
Repair 384