Fujitsu AU A36LCLU Series Service Instruction page 65

Trouble shooting 21
INDOOR UNIT Error Method:
Indoor Fan Motor Lock Error
Indoor Fan Motor Rev. Error
Detective Actuators:
Indoor Unit Controller PCB
Indoor Unit Power PCB
Indoor Fan Motor
Forecast of Cause:
1. Fan Motor failure
3. Power PCB failure
Check Point 1 : Check rotation of Fan
Check if the Fan Motor is lock.
(Can the Fan be rotated by hand when operation is off.)
Check the Fan loosening.
(Lock-nut loosening, defective propeller fan)
>> If Fan Motor 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 Power PCB and Controller PCB
If Check Point 1, 2 do not improve the symptom,
replace Power PCB and Controller PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When the condition that actual rev. of Indoor Fan is 1/3 or less.
Or the condition of fan speed is 0rpm is continued more than 56 seconds.
2. Motor protection by surrounding temperature rise
4. Controller PCB failure
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