Mitsubishi SRK19CNS-S, Technical Manual

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'14•SRK-T-164
(6) Inspection procedures corresponding to detail of trouble
Sensor error
[Broken sensor wire,
connector poor connection]
Is connector connection good?
YES
YES
NO
NO
Replace PCB.
Correct connection.
Replace sensor. Is sensor resistance value good?
Indoor fan motor error [Defective fan motor, connector poor
connection, defective indoor PCB]
Is connector connection good?
YES
NO
NO
Is the output of the indoor unit
PCB normal?
Power supply reset
NO
YES
YES
Correct connector connection
Is DC fan motor resistance value good?
Replace indoor PCB
Replace indoor fan motor
Notes () See page for the DC fan motor and indoor PCB check
procedure.
() After making sure the DC fan motor and indoor PCB are
normal, connect the connectors and confirm that the fan
motor is turning.
(If power is turned on while one or the other is broken down,
it could cause the other to break down also.)
* Disconnect the fan motor
connector, then investigate
the DC fan motor and indoor
PCB separately.
(Short circuit)
(Broken wire)
◆
Sensor temperature characteristics
(Room temp., indoor heat exchanger temp.,
outdoor heat exchanger temp., outdoor air
temp.)
Temperature (˚C)
Resistance (k
Ω
)
30
25
20
15
10
5
30 20 10 40 50 60 70 0
-10
◆
Discharge pipe sensor temperature characteristics
0
0 20 40 60 80 100 120 135
20
40
60
80
100
120
140
160
180
(Short circuit)
(Broken wire)
Temperature (˚C)
Resistance (k
Ω
)
Is normal state restored?
Malfunction by temporary
noise
NO
Replace fan motor (If anomaly
persiste after replacing fan motor,
replace indoor PCB)
YES