Service Manual

Trouble shooting 12

INDOOR UNIT Error Method:

Indoor Unit Fan Motor Error

Indicate or Display:

Indoor Unit : Operation LED 5 times Flash, Timer LED 1 Times Flash,

Economy LED Continuous Flash.

Outdoor Unit : E.5 U.1

Error Code : 5 1

Detective Actuators:

Indoor Unit Controller PCB

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 : Replace Controller PCB

Forecast of Cause : 1. Fan MOTOR failure 2. Fan motor winding open 3. Motor protection by surrounding temp. increase

4. Controller PCB failure

Change Controller PCB and execute the check operation again.

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