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cuts off after about 55 seconds and heater light flashes. No error codes. Ignites again after about 30 seconds and the process just repeats. It will still heat my pool spa to 100 in 45 minutes even w cycling. I’ve jumped both sensors on sides of manifold and same result. Checked all grounds...

So this is embarassing... I just realized after reading on this forum that there are union fittings(1.5" inside and 2" slip outside) that allow you to plumb a new pump into both a 1.5" system and a 2" system. Well.. after at least 4 years I realized I plumbed 1.5" into a 2" system. See attached...