Carrier 42QHP09E8S Service Manual page 69

Index:
1. Indoor or Outdoor 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 (voltage: 220-240V~):
2. Outdoor DC Fan Motor (control chip is in outdoor PCB)
Power on ,and check if the fan can run normally, if the fan can run normally, the PCB must has problems and need to
be replaced, If the fan can't run normally, measure the resistance of each two pins. If the resistance is not equal to each
other, the fan motor must have problems and need to be replaced, otherwise the PCB must has problems and need to
be replaced.
3. Indoor AC Fan Motor
Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of
pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply) or 50V(115V power supply), 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
Voltage
280V~380V
---
0V
14-18.5V
0~5.6V
14-18.5V
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