Carrier 40MAHBQ06XA Service Manual page 22

SG-40MAHB-01: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Index 1
1. Indoor or Outdoor DC Fan Motor (control chip is in fan motor)
Power on and when the unit is in standby, measure the pin1-pin3, pin4-pin3 voltage in the fan motor connector. If the voltage value is not
in the range shown in Table 11 or Table 12, the PCB has malfunctioned and needs to be replaced.
Table 11 — DC motor voltage input and output (voltage: 220-240V~)
Table 12 — DC motor voltage input and output (voltage: 115V~)
2. Outdoor DC Fan Motor (control chip is in the outdoor PCB)
Power on the air conditioner to ensure the fan runs normally. If the fan runs normally, the PCB has an issue and needs to be replaced. If
the fan does not run normally, measure the resistance of each two pins. If the resistance is not equal to each other, the fan motor has
malfunctioned and needs to be replaced, otherwise the PCB has malfunctioned and needs to be replaced.
3. Indoor AC Fan Motor
Power on the air conditioner and set it to FAN mode at the high fan speed. Run for 15 seconds and then measure pin1 and pin2 voltage. If
the voltage value is less than 100V (208~240V power supply) or 50V (115V power supply), 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.
Fig. 25 — Motor Connector
No. Color
1 Red
2 ---
3 Black
4 White
5 Yellow
6 Blue
No. Color
1 Red
2 ---
3 Black
4 White
5 Yellow
6 Blue
Signal Voltage
Vs/Vm 280V~380V
--- ---
GND 0V
Vcc 14-17.5V
Vsp 0-5.6V
FG 14-17.5V
Signal Voltage
Vs/Vm 140V~190V
--- ---
GND 0V
Vcc 14-17.5V
Vsp 0-5.6V
FG 14-17.5V
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