226
(3) Inspection procedures corresponding to detail of trouble
Thermistor error
[Broken thermistor wire,
connector poor connection]
Is connector connection good?
YES
YES
NO
NO
Replace PCB.
Is thermistor resistance value good?
Correct connection.
Replace thermistor.
30
25
20
15
10
5
30
20
10
40 50 60
7
0
–10
Temperature (˚C) Resistance (kΩ) Temperature (˚C) Resistance (kΩ)
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
◆ Thermistor temperature characteristics
(Room temp., indoor and outdoor unit heat
exchanger temp., outdoor temp.)
◆ Comp. dome thermistor temperature characteristics
Temperature (˚C)
(Shortcircuit)
(Broken wire)
Resistance (kΩ)
Current cut
[Open phase on compressor output
terminal, compressor lock]
YES
YES
NO
NO
YES
NO
¡ Check compressor wiring visually.
¡ Check insulation resistance. (1 MΩ or over)
¡ Check coil wire resistance. (Few Ω)
Does current cut operate when
operating inverter with compressor
wire disconnected?
Is output voltage applied to all 3
phases of power transistor?
Is there any shortcircuit?
Inspect compressor.
Defective inverter
Defective inverter
Secure space for inlet
and outlet.
If check results are normal,
compressor is locked.
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