Question about Hayward H400idl2 400,000 Btu Low Nox Heater Natural Gas
Make a hole and silicone in a drain hose, or silicone the leak directly
Posted on Jul 13, 2009
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Posted on Jan 02, 2017
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Thank you for posting your question here on Fixya.com.
Does the banging continue until the heater eventually shuts off or does it quit shortly after the heater burners start up? In either case you can repair the heater for much, much less than a new unit. The bypass may be the issue if it is stuck closed. You will also want to inspect the control valve in the header and inspect the overall condition of the heat exchanger. It is likely aggressive water has damaged some or all of these parts causing the banging noise you hear. It is also possible there is an issue with the pump and/or filter not getting enough flow thru the heater but I have to assume your pool man eliminated those possibilities when he looked at the heater.
Was the pool man not able to repair or at least inspect the heater further for you?
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