Indoor Unit Fan Motor Error - Fujitsu Airstage J-II Service Manual

Trouble shooting 8
INDOOR UNIT Error Method:

Indoor Unit Fan Motor 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 surrounding temp. increase
4. Capacitor failure 5. 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 Motor winding
Check Indoor Fan motor
>>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.
Indicate or Display:
Outdoor Unit : E.5 U.1
Indoor Unit : Operation LED 5 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.
Error Code : 5 1
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.
04-18
Attention!!
In case of Duct type, replace Controller PCB
and set up the original address, since it is a
tapping control.