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@Tom17 - Unfortunately for you I cannot provide you any assistance as to what the problem is. Hayward advised me this morning that they are just going to replace my heater rather than fix it. Sorry.

Update - Hayward has come back and indicated that they believe it is the heat exchange. They are sending a replacement to the tech. They can't give me an ETA because the supply chain of parts has been significantly impacted due to COVID-19. Stay tuned.

I wish I had an answer. The tech didn't know what was wrong with it. He speculated on the heat exchange but when he pulled it out he didn't see anything out of the ordinary. He took pictures and documented everything and said he'd be going back to Hayward to get their recommendation. He...

Hi Tom - I'm going to start following this thread because my 1 month old Hayward H100ID heater started doing the exact same thing last week. It was running perfectly since May 5th but on May 26th it began to 'scream'. We contacted where we bought it and they told us to deal directly with...