Banging noise when unit starts in attic

by Jack
(Lawrenceville, GA. USA)

Trane XE1000
Mod.#TWR030C100A5

Just as the attic unit fan begins to blow there is a banging noise as if it's having a hard time starting.

I have had service people out 3 times and they can't find what is wrong. Of course it doesn't do it while they are here.

Now I have noticed the lights dimming, just a little, as the banging is getting worse, and louder.

Will call service again, but maybe someone can give me an idea of what is going on.

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Oct 25, 2014
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Oil-canning
by: Jack

Thank you for the reply.
Can you tell me what "Oil Canning of return" means? My AC repair man never mentioned that. Maybe I should mention it to him. All other items you mentioned in your post have been checked.
Thanks
Jack

Oct 23, 2014
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Airhandler Noise
by: Ex-HVAC Instructor

Possibilities:
-Loose or broken blower motor mount.
-Loose or damaged squirrel cage blower.
-Loose or improperly installed blower housing.
-Oil-canning of Return or Supply ducs.

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