Carrier 40MBFAQ Service Manual page 20

40MBFAQ: Service Manual
CN1 Communication with the Main PCB
3. 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
malfunctioned and needs to be replaced. Otherwise the PCB has malfunctioned and needs to be replaced.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
5 4 3
NO SIGNAL
1 Vcc
2 GND
3 TXD
4 RXD
5 --
20
2 1
VOLTAGE
+15V
0~6V
0~15V
--
fan motor has