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Control chip is in main PCB
NO.
1
Color
Orange
Signal
Hu
Color
Red
Signal
W
1) Release the UVW connector. Measure the resistance of U-V, U-W, V-W. If the resistance is not equal to each other, the fan
motor must have problems and need to be replaced. Otherwise, go to step 2.
2) Power on and when the unit is in standby, measure the voltage of pin4-5 in feedback signal connector. If the value is not 5V,
change the PCB. Otherwise, go to step 3.
3) Rotate the fan by hand, measure the voltage of pin1-5, pin 2-5 and pin 3-5 in feedback signal connector. If any voltage is
not positive voltage fluctuation, the fan motor must have problems and need to be replaced.
Electrical Control System
2
3
Grey
White
Hv
Hw
Blue
Yellow
V
U
4
5
Pink
Black
Vcc
GND
Troubleshooting
111
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