Samsung SH12VCD Service Manual page 26

5-3-6 Check of discharge temperature sensor and comp top OLP temperature sensor.
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.
Ambient temperature
(°C)
Resistance of
thermistor [KΩ]
5-3-7 Check the deice temperature sensor and outdoor temperature sensor
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.
Ambient temperature
(°C)
Resistance of
thermistor [KΩ]
5-3-8 Check of operation current abnormal increase mode
The operation abnormal current mode is the protection control for the safe operation by
detecting 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 tem-
perature 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.
Samsung Electronics
0°C 10°C 20°C
362
553
242
20°C
15°C 25°C
14.68 12.09
30°C 40°C
166 165
30°C
35°C
10 6.94
8.31
Troubleshooting
50°C
82
40°C
5.83
5-7