Carrier 42QFD048D8S Service Manual page 93

Index:
1. DC Fan Motor(control chip is in fan motor)
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.
• DC motor voltage input and output:
No. Color Signal
1 Red Vs/Vm
2 --- ---
3 Black GND
4 White Vcc
5 Yellow Vsp
6 Blue FG
 Troubleshooting
Voltage
200V~380V
---
0V
13.5-16.5V
0~6.5V
13.5-16.5V
