Fujitsu AUXB04GALH Service Manual page 104

Trouble shooting 26
INDOOR UNIT Error Method:
Indoor Unit Fan Motor 1 rotation
speed Error
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 ambient temp. increase
4. Capacitor 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 Motor winding / Internal PCB circuit
Check Indoor Fan motor ( Refer to the PARTS INFORMATION 13,14)
>>If Fan motor is abnormal, replace it.
OK
Check Point 3 : 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 4 : Check Motor Capacitor (*)
Check continuity of motor capacitor
>>If it is shorted, replace the capacitor.
OK
Check Point 5 : Replace Controller PCB
Change Controller PCB and set up the original address.
E51. 2
Indicate or Display:
Outdoor Unit : E.5 U.1
Indoor Unit
Error Code
Detective details:
When the FAN motor feed back rotation value which is detecting on the
controller PCB becomes 0 and lasts for more than 1 minute at motor
operation condition.
Or, when the feed back rotation value contimues at 1/ 3 of target value for
more than 1 minute.
5. Controller PCB failure
04-34
: Operation LED 5 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.
: 5 1
* Applicable indoor unit:
- ARXA, ARXB, ARXC type