Troubleshooting
131
Connector of outdoor unit control board
(PIN#3,4 of CN51 - discharge temperature sensor), (PIN#1,2 of CN52-OLP Temperature sensor)
Measure the resistance between two wires and if it is same as follows, it is normal but if not,
replace.
Connector of outdoor unit control board
(PIN#1,2 of CN51 - outdoor temperature sensor),(PIN#3,4 of CN52-deice Temperature sensor)
Measure the resistance between two wires and if it is same as follows, it is normal but if not,
replace it.
Connector of outdoor unit IPM board(CN02)
Measure the resistance between two wires and if it is same as follows, it is normal but if not,
replace it.
The operation abnormal current mode is the protection control for the safe operation by detect-
ing the operation current of inverter aircon by the current sensor on the control board.
If the operation current abnormal increase occurs,
♦The ventilation is not good because the outdoor unit is installed wrong (the ambient tempera-
ture is higher than 50 °C)
-> Reinstall the outdoor unit so that the good ventilation can be made.
♦If the Refrigerant is overcharged.
-> Check the amount of Refrigerant.
♦If the comp is locked.
-> Replace the comp.
♦If the comp is operating without the revolution of fan motor.
-> Check the fan motor connector, replace the fan motor.
♦If the protection cover is operating with bending to the outdoor.
-> Take out the protection cover.
♦If two outdoor units are operating face to face. (the bad ventilation is made)
-> Reinstall the outdoor unit for the good ventilation.
♦The air circulation is bad due to the attachment of falling leaves
-> Take away the leaves for the good ventilation.
Check the elements of current sensor block of the outdoor control board.
♦R506 — 680Ω ♦R507 — 1.8 KΩ ♦R508 — 10 KΩ
0°C
Ambient temperature
(°C)
Resistance of ther-
mistor [KΩ]
553
362
242
166 165
82
10°C 20°C
30°C
40°C 50°C
Ambient temperature
(°C)
Resistance of ther-
mistor [KΩ]
15°C
14.68 12.09
10
8.31
6.94 5.83
20°C
25°C
30°C
35°C 40°C
Ambient temperature
(°C)
Resistance of ther-
mistor [KΩ]
15°C
77.4 61.4
49.1
39.5
31.9 26
20°C
25°C
30°C
35°C 40°C
◆ Check of discharge temperature sensor and comp top OLP temperature sensor.
◆ Check the defrost temperature sensor and outdoor temperature sensor
◆ Check the heatsink temperature sensor of IPM
◆ Check of operation current abnormal increase mode
00150A(2)-100-139* 2/5/01 12:01 PM Page 131
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