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I thought i would post a followup as it may help someone else later. My front LED display has been shot for years, so i figured i would replace that first to hopefully help by displaying a trouble code. After installing the new LED display and button control it would not illuminate. This led to...

I have a Hayward H series 400 k BTU heater, and yesterday it would hot fire up. The heater is about 15 years old and has never really given me any issues except i had the change the temp sensor once. I opened it up and did some brief diagnostics and I may have stumbled on something that may or...