My refrigerator (Bosch B22CT80SNS01) sits in an alcove and has begun intermittently making a noise from what seems to be the inside. At first I thought it was the water filter/lines having air, but I’ve switched the filter and cycled water for a few minutes. Running the water doesn’t stop the noise when it’s happening either, nor does it sputter.

It sounds like it’s behind an inside panel at the top, maybe a fan or something? See video below.


  • The ice maker or maybe the defrost cycle?? – JACK Sep 29 '19 at 14:48
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    I took off the grill where the noise was originating and the insulation components behind it. A little motor that opens a door to let cold air flow into the refrigerator from the freezer was making the racket. Looking it up online shows it's the "Refrigerator Air Damper Control Assembly" here. I think this is what I need to replace. – Untitledfolder Sep 29 '19 at 15:49
  • Those do frequently go bad so good job and good luck – JACK Sep 29 '19 at 15:53

It turns out it was the air damper motor and so replacing the assembly did the trick! No more noise.

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    Hello, and welcome to Home Improvement. Thanks for answering your own question. You can click the checkmark next to your answer to indicate it's the "right" one. – Daniel Griscom Oct 2 '19 at 23:31
  • Done! Thanks for the tip! – Untitledfolder Oct 4 '19 at 0:05

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