Mitsubishi FDT100VNXWVH Service Manual page 53

(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
1-time
ON
flash
Keeps
flashing
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 unit 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 source
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 unit control PCB •Defective indoor unit control PCB (Defective limit switch input circuit)?
Indoor-outdoor
units connection • Poor connection, breakage of indoor-outdoor units connection wire
Keeps
2-time
wire
flash flashing
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 unit control PCB (defective communication circuit)?
indoor unit 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 unit control PCB
Keeps
Stays OFF
flashing
Outdoor unit control *
•Occurrence of defective outdoor unit control PCB on the way of power source (defective
PCB communication circuit)?
Outdoor unit control
•Defective outdoor unit control PCB on the way of power source
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 unit control PCB •Defective indoor unit control PCB (Defective temperature sensor 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 unit control PCB •Defective indoor unit control PCB (Defective temperature sensor 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 unit control PCB •Defective indoor unit 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 unit control PCB •Defective indoor unit control PCB
Remote control
Keeps
Stays OFF temperature • Broken wire of remote control temperature sensor
flashing
sensor
Description of trouble
* For wire breaking at power ON, the LED is OFF
52
- -
'20 • PAC-SM-351
Reference
Repair method
page
— —
Repair 136
Repair
137
Replacement of
remote control
Replacement, repair
138
Replacement of
PCB
Repair 139－143
Repair
145
Replacement of
remote control or
PCB
Repair
Power reset or
Repair
146
Replacement of
PCB
Replacement
Replacement, repair
of temperature
sensor 1
Replacement of
PCB
147
Replacement, repair
of temperature
sensor 2
Replacement of
PCB
Replacement, repair
of temperature
sensor 148
Replacement of
PCB
Repair 149
Repair 150
Replacement, repair
151
Replacement
Repair 152