Fujitsu AB F18LAT Series Service Instruction page 45

Trouble shooting 11
INDOOR UNIT Error Method:
Indoor Fan Motor abnormal
Detective Actuators:
Indoor Unit Controller PCB Circuit
Indoor Fan Motor
Forecast of Cause:
1. Fan rotation failure 2. Fan motor winding open 3. Motor protection by surrounding temperature rise
4. Control 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 : Replace Controller PCB
If Check Point 1- 2 do not improve the symptom, replace Controller PCB.
Indicate or Display:
Outdoor Unit : No indication
ERROR CODE : E : 12
Detective details:
When the condition that actual frequency of Indoor Fan is
below 1/3 of target frequency is continued more than 56 seconds.
02-14