Hot Water Recirculator Knocking

janinemc · Feb 7, 2008

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 · Feb 8, 2008

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

Sponsor · 2022-01-29T12:20:58-0800

Toolaholic · Feb 8, 2008

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

janinemc · Feb 15, 2008

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

hj · Feb 15, 2008

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.

Hot Water Recirculator Knocking

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