Fujitsu Airstage J-II, Service Manual

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Trouble shooting 8
INDOOR UNIT Error Method:
Indoor Unit Fan Motor Error
Indicate or Display:
Indoor Unit : Operation LED 5 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.
Outdoor Unit : E.5 U.1
Error Code : 5 1
Detective Actuators:
Indoor Unit Controller PCB Circuit
Indoor Fan Motor
Detective details:
When Indoor fan control is either phase control or DC control and rotation feed
back control is ON, the feed back rotation value becomes 0 and lasts for more
than 1 minute at motor operation condition. Or, the feed back rotation value
continues at 1/3 of target value for more than 1 minute.
Check Point 2 : Check Motor winding
Check Indoor Fan motor
>>If Fan motor is abnormal, replace it.
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 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..
Check Point 4 : Check Motor Capacitor
Check continuity of motor capacitor
>>If it is shorted, replace the capacitor.
Check Point 5 : Replace Controller PCB
OK
OK
OK
OK
Forecast of Cause : 1. Fan rotation failure 2. Fan motor winding open 3. Motor protection by surrounding temp. increase
4. Capacitor failure 5. Control PCB failure
Attention!!
In case of Duct type, replace Controller PCB
and set up the original address, since it is a
tapping control.
Change Controller PCB and set up the original address.
04-18