Mitsubishi SRK10CES, Technical Handbook

Page: 198 / 260

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196
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(f) Inspection procedures corresponding to detail of trouble
Sensor error
[Broken sensor wire,
connector poor connection]
(Shortcircuit)
(Broken wire)
Is connector connection good?
YES
YES
NO
NO
Replace PCB.
Correct connection.
Replace sensor. Is sensor resistance value good?
◆
Sensor temperature characteristics
(Room temp., indoor unit heat exchanger
temp., outdoor unit 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
Temperature (˚C) Resistance (k
Ω
) Temperature (˚C) Resistance (k
Ω
)
0 164 70 8.7
5 127 75 7.3
10 99 80 6.2
15 78 85 5.3
20 62 90 4.5
25 50 95 3.9
30 40 100 3.3
35 32 105 2.9
40 26 110 2.5
45 21 115 2.2
50 17 120 1.9
55 14 125 1.6
60 12 130 1.4
65 10 135 1.3
◆
Discharge pipe sensor temperature characteristics
Indoor fan motor error
[Defective fan motor, connector
poor connection, defective PCB]
Is connector connection good?
YES
NO
NO
Is the output of the indoor unit’s
printed circuit board normal?
Normal
NO
YES
YES
Correct connector connection
Is DC fan motor resistance value good?
Replace indoor PCB
Replace indoor fan motor
Notes (1) See pages 199 for the DC fan motor and indoor unit circuit
board check procedure.
(2) After making sure the DC fan motor and indoor unit circuit
board 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
unit circuit board separately.