Mitsubishi SRK100VNXWPZSX, Руководство по обслуживанию

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52
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'20 • PAC-SM-351
(i) Indoor unit
Remote control Indoor unit display Outdoor unit 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
Stays OFF
Keeps
flashing
— ON
— —
— —
— —
— —
— —
— —
•Normal operation
— —
136
137
138
145
146
147
149
150
151
152
139 － 143
2-time
flash
Stays OFF Indoor unit power
source
•Power OFF, broken wire/blown fuse, broken transformer wire Repair
Keeps
flashing
Remote control
wires
•Poor connection, breakage of remote control wire * For wire breaking at power ON, the
LED is OFF.
Repair
Remote control • Defective remote control PCB
Replacement of
remote control
WAIT
or
INSPECT I/U
Keeps
flashing
Indoor-outdoor
units connection
wire
• Poor connection, breakage of indoor-outdoor units connection wire
Repair
Remote control • Improper setting of master and slave by remote control
Keeps
flashing
Stays OFF
Keeps
flashing
Remote control
wires (Noise)
•Poor connection of remote control signal wire (White)
•Intrusion of noise in remote control wire
* For wire breaking at power ON, the LED is OFF
Repair
Remote control
indoor unit control PCB
*
• Defective remote control or indoor unit control PCB (defective communication circuit)?
Replacement of
remote control or
PCB
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 unit control PCB
Power reset or
Repair
Outdoor unit control
PCB
*
•Occurrence of defective outdoor unit control PCB on the way of power source (defective
communication circuit)?
Replacement of
PCB
ON
ON
ON Stays OFF
Outdoor unit control
PCB
•Defective outdoor unit control PCB on the way of power source
Replacement
Fuse •Blown fuse
Stays OFF
Keeps
flashing
Number of con-
nected indoor units
•When multi-unit control by remote control is performed, the number of
units is over
Repair
ON Stays OFF
Keeps
flashing
Fan motor •Defective fan motor Replacement, repair
Replacement, repair
Indoor unit control PCB •Defective indoor unit control PCB Replacement
Stays OFF
Keeps
flashing
Remote control
temperature
sensor
• Broken wire of remote control temperature sensor 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.
Stays OFF
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 unit control PCB
•Defective indoor unit control PCB (Defective temperature sensor 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
•Defective indoor unit control PCB (Defective limit switch input circuit)?
Replacement of
PCB
Stays OFF 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 unit control PCB
•Defective indoor unit control PCB (Defective temperature sensor input
circuit)?
Replacement of
PCB
Keeps
flashing Stays OFF
Keeps
flashing
Indoor unit No. set-
ting
•No master is assigned to slaves.
Repair
Rcmote control wires •Anomalous remote control wire connection, broken wire between master and slave units
148
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 unit control PCB
•Defective indoor unit control PCB (Defective temperature sensor input
circuit)?
Replacement of
PCB
ON
2-time
flash
6-time
flash
6-time
flash
6-time
flash
2-time
flash
Keeps
flashing
1-time
flash
3-time
flash
2-time
flash
3-time
flash
6-time
flash
6-time
flash
No-indication
Indoor unit control PCB
2) SRK series