Fujitsu ASU18RMLQ Service Instruction page 51

Trouble shooting 18
OUTDOOR UNIT Error Method:
Outdoor Unit Fan Motor Error
Detective Actuators:
Outdoor Unit Main PCB Circuit
Outdoor Fan Motor
Forecast of Cause:
1. Fan rotation failure 2. Motor protection by surrounding temperature rise 3. Main PCB failure
Check Point 1 : Check rotation of Fan
Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)
>>If Fan or Bearing is abnormal, replace it.
OK
Check Point 2 : Check ambient temp. around motor
Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)
>>Upon the temperature coming down, restart operation.
OK
Check Point 3 : Check Output Voltage of Main PCB
Check outdoor unit circuit diagram and the voltage.
(Measure at Main PCB side connector)
RED
1
2
BLACK
CN802
3
WHITE
4
YELLOW
5
BLUE
6
Read wire DC voltage
Red - Black 150
White - Black
If the voltage is not correct, replace Main PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When outdoor fan rotation speed is less than 100rpm in 20 seconds
after fan motor starts, fan motor stops.
After fan motor restarts, if the same operation within 60sec is repeated
3 times in a row, compressor and fan motor stops.
If and
permanently.
FAN MOTOR
FM
380V
15 1.5V
02-25
repeats 5 times in a row, compressor and fan motor stops