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I have ahayward H1001D1 above ground pool heater running on nat gas has worked for 3 seasons with no problems last week heater started to make banging sound as if it was rapid cycling ichanged filter and checked water flow across heater it seems fine heater is still making banging noise please give trouble shooting help i am a electrical contractor thank you

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If your external by-pass is closed almost all the way then it will be your internal by-pass. You find this assembly inside the water manifold at the side of the heater. Part should be about 70-80 bucks.
It is suppose to regulate the water flow so it has time to heat but not boil. Yours is probally missing the control disc and letting all the water flow past the heater so the water in the heater is boiling and that is the banging you hear. Good luck.

Posted on Sep 04, 2010

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Posted on Jan 02, 2017

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