Fujitsu ARU7RLF Service Instruction page 65

Trouble shooting 26
OUTDOOR UNIT Error Method:
Outdoor Unit Fan Motor Error
Detective Actuators:
Outdoor unit Main PCB
Outdoor unit fan motor
Forecast of Cause:
1. Fan rotation failure
4. Outdoor unit fan motor 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 Outdoor unit fan motor
Check Outdoor unit fan motor. (PARTS INFORMATION 5)
>>If Outdoor Fan Motor is abnormal, replace Outdoor fan motor and Main PCB.
OK
Check Point 4 : Check Output Voltage of Main PCB
Check outdoor unit circuit diagram and the voltage. (Measure at Main PCB side connector)
For AOU18 / 24RLXFZ For AOU18 / 24RLXFZ
RED
1
2
3
BLACK
CN800
4
WHITE
5
YELLOW
6
BROWN
7
For AOU36RLXFZ
RED
1
2
3
BLACK
CN802
4
WHITE
5
YELLOW
6
BLUE
7
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.
2. Motor protection by surrounding temperature rise
FAN MOTOR
FM
Read wire
Red - Black
FAN MOTOR
White - Black
FM
repeats 5 times in a row, compressor and fan motor stops
DC voltage
300 - 400V
15 1.5V
02-30
3. Main PCB failure