Weil-McLain Prepurge Thump (video)

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Biks

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I have a Weil-McLain Ultra Series 3 gas boiler. I'm getting this loud thump when it starts it's PREPURGE cycle. Should it be this loud? Is this normal? Should there be any sound?

 

Fitter30

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Inducer fan needs to be pulled and inspected along with the heat exchangers. Fan running should be smooth running and just air noise that bang could be delayed ignition.
 
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