Weird knocking sound

Old 07-25-06, 12:11 PM
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Join Date: Apr 2005
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Weird knocking sound

Everytime I turn on the central AC, there's an unusual soft knocking (1 second interval) noise coming from the sink pipe in the bathroom upstair, is this a symptom of some major issue?
Old 07-25-06, 03:45 PM
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Sounds like somene tied the AC drain into the house waste lines. Where I live this is against code. You may have lucked up though and this is letting you know there is something shaking that shouldnt be. If you have a pump that brings water up from the condensate pan to a drain this may be the bumping noise you hear. Take a look around and see whats shaking. It may be something you can take care of without calling the HVAC guys. My AC starting shaking and I vaccumed the blower and it worked great after that.

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