Hot Water Recirculator Knocking

J

janinemc

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• Feb 7, 2008

• #1

My hot water recirculator knocks regularly when it is on. It used to do it occasionally and in the last week it started doing it whenever it is on. I don't know where to being to troubleshoot this. Your thoughts are appreciated.

 

Toolaholic

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• Feb 8, 2008

• #2

Do You have an expansion tank? Are the pipes secured well,and not against one another? Air chambers on the H+COLD risers

 

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Toolaholic

General Contractor Carpenter

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• Feb 8, 2008

• #3

Do You have an expansion tank? Are the pipes secured well,and not against one another? Air chambers on the H+COLD risers. ?

 

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janinemc

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• Feb 15, 2008

• #4

I honestly don't know. I will inspect my hot water heater closet and better understand the configuration. Thanks for the starting point.

 

hj

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• Feb 15, 2008

• #5

knock

Probably the check valve. There may be something impeding the flow so it opens and closes, or something may cause a backflow so it is pushed closed after, or while, the pump is trying to keep it open.