Fujitsu ARU18RLF Service Instruction

02-30
Trouble shooting 26
OUTDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause:
Check Point 3 : Check Outdoor unit fan motor
OK
Outdoor Unit Fan Motor Error
1. Fan rotation failure 2. Motor protection by surrounding temperature rise 3. Main PCB 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.
Check Point 4 : Check Output Voltage of Main PCB
Check outdoor unit circuit diagram and the voltage. (Measure at Main PCB side connector)
If the voltage is not correct, replace Main PCB.
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 repeats 5 times in a row, compressor and fan motor stops
permanently.
Read wire DC voltage
CN800
1
2
3
4
5
6
7
BLACK
FM
FAN MOTOR
Check Point 2 : Check ambient temp. around motor
OK
Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)
>>Upon the temperature coming down, restart operation.
Indicate or Display:
Refer to error code table.
CN802
1
2
3
4
5
6
7
BLACK
FM
FAN MOTOR
For AOU36RLXFZ
For AOU18 / 24RLXFZ For AOU18 / 24RLXFZ
RED
BLUE
YELLOW
WHITE
RED
BROWN
YELLOW
WHITE
15 1.5V
White - Black
300 - 400V
Red - Black
Check Outdoor unit fan motor. (PARTS INFORMATION 5)
>>If Outdoor Fan Motor is abnormal, replace Outdoor fan motor and Main PCB.
Outdoor unit Main PCB
Outdoor unit fan motor
OK

Fujitsu ARU18RLF Specifications

General

Brand	Fujitsu
Model	ARU18RLF
Category	Air Conditioner
Language	English