Question about Alpine Air XL-15 Air Purifier

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Fan motor changes speeds on its own.

I have noticed that the fan motor sounds like it is changing speed on its own. What would be causing this?

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The control component or the control circuit for the fan can be causing the speed variation, or the bearings on the thing can be wearing (or contaminated) with the same result. If you can make a test bench, look (feel with a test pad, really) for drive transistors that get hotter than they should or an inconstant power resistor or shunt.

Posted on Jun 23, 2008

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NOTE:It is easier to remove the motor when the upper housing is still sitting on top of the lower housing unit.
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  2. Next to the speed directions buttons there are thumb tabs. Press the thumb tabs so that they pop up and unlock the upper housing flaps. a tumb tab on
  3. The four flaps should then drop down like the peddles of a flower.
  4. Grab the center of the motor and lift straight up, be careful when pulling the power chord.
  5. The motor, fan and gear assembly should not be seperated from the rest of the unit.
This will let you clean with vinegar and water.

Great product. Germany design at its best

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