Mitsubishi Heavy Industries FDT100VNVF1 Technical Manual page 340

Remote control Indoor control PCB
Green
Error code Red LED Red LED
LED (1)
1(2)-time Keeps
flash flashing
1-time Keeps
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 control Indoor unit display
Error code Red LED RUN light TIMER light Red LED Green LED
ON Stays OFF
— —
— —
No-indication Stays OFF
Keeps
Stays OFF
flashing
or
WAIT
— —
INSPECT I/U
— —
6-time
ON
flash
6-time
ON
flash
6-time
ON
flash
Keeps
flashing
1-time
ON
flash
3-time
ON
flash
2-time
No-indication
ON
flash
— —
3-time Keeps
flash flashing
6-time
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 control
Keeps
Stays OFF temperature • Broken wire of remote control temperature thermistor
flashing
thermistor
Outdoor control PCB
Location of
trouble
Keeps
Stays OFF —
•Normal operation
flashing
2-time Indoor unit power
Stays OFF •Power OFF, broken wire/blown fuse, broken transformer wire
flash supply
Remote control •Poor connection, breakage of remote control wire * For wire breaking at power ON, the
wires LED is OFF.
Keeps
Stays OFF
flashing
Remote control • Defective remote control PCB
•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-time Keeps
wire
flashing
flash
Remote control • Improper setting of master and slave by remote control
•Poor connection of remote control signal wire (White)
Remote control
wires (Noise)
•Intrusion of noise in remote control wire
Keeps
Stays OFF
flashing
Remote control
*
• Defective remote control or indoor control PCB (defective communication circuit)?
indoor control PCB
Indoor-outdoor
•Poor connection of wire between indoor-outdoor units during operation
2-time 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
Keeps
PCB
Stays OFF
flashing
Fuse
•Blown fuse
Indoor heat •Defective indoor heat exchanger temperature sensor 1 (defective element, broken
exchanger tempera wire, short-circuit)
6-time
ture sensor 1 • Poor contact of temperature sensor 1 connector
Stays OFF
flash
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)?
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 sensor input
circuit)?
Keeps Number of con- •When multi-unit control by remote control 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 control wires •Anomalous remote control 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 control
Keeps
Stays OFF temperature therm- • Broken wire of remote control temperature thermistor
flashing
istor
Description of trouble
Description of trouble
* For wire breaking at power ON, the LED is OFF
339
- -
'13 • PAC-T-198
Reference
Repair method
page
Replacement, repair
402
Replacement
Repair 403
Repair 404
Reference
Repair method
page
— —
Repair 434
Repair
435
Replacement of
remote control
Replacement, repair
436
Replacement of
PCB
Repair 437−441
Repair
443
Replacement of
remote control or
PCB
Repair
Power reset or
Repair
444
Replacement of
PCB
Replacement
Replacement, repair
of temperature
sensor 1
Replacement of
PCB
445
Replacement, repair
of temperature
sensor 2
Replacement of
PCB
Replacement, repair
of temperature
446
sensor
Replacement of
PCB
Repair 447
Repair 448
Replacement, repair
449
Replacement
Repair 450