Carrier 42QFD048D8S Service Manual page 95

Index:
1. Outdoor DC Fan Motor (control chip is in outdoor PCB)
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 has problems and need to be replaced. otherwise the PCB must has problems and need to be replaced.
2. DC Fan Motor(control chip is in fan motor, single fan)
Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the
value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced.
No. Color Signal
1 Red Vs/Vm
2 --- ---
3 Black GND
4 White Vcc
5 Yellow Vsp
6 Blue FG
 Troubleshooting
Voltage
192V~380V
---
0V
13.5-16.5V
0~6.5V
13.5-16.5V
