Fujitsu AB Series A18LATN Service Instruction page 89

Trouble shooting 19
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)
AB*A18L/ 24L
RED
1
2
BLACK
3
WHITE
CN801 4
YELLOW
5
BROWN
6
Read wire
Red - Black
White - Black
If the voltage is not correct, replace Main PCB.
Indicate or Display:
Outdoor Unit (AB*A12L/ 24L) : LED 5sec ON/ 5sec OFF
ERROR CODE : E : 1b
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
permanently.
AB*A36L/ 45L
FAN MOTOR
FM
DC voltage
150 390V
∼
15 1.5V
(AB*A36L/ 45L) : LED 15 times blink (Upper fan)
LED 16 times blink (Lower fan)
and repeats 5 times in a row, compressor and fan motor stops
RED
1
2
3
BLACK
CN800 4
WHITE
5
YELLOW
6
BROWN
7
RED
1
2
3
BLACK
CN801 4
WHITE
5
YELLOW
6
BROWN
7
Read wire DC voltage
Red - Black 300
White - Black 15 1.5V
07-21
FAN MOTOR 1
FM
FAN MOTOR 2
FM
400V
∼