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Had same issue with first heater I had -- after several years it failed with water inside -- took apart and took manifold to a radiator shop and for $50 they fixed the hole and cleaned it -- worked another 2 years. If u are handy can replace the manifold, but looking on line I found a new unit...

I really do appreciate your educating on this blog, and not to belabor the point, but if the missing bypass valve now cut water flow thru the coil sufficiently to be a problem the heater should not heat the spa as quickly as it does now and the temp limit switch should stop the heater as it...

Thanks for the help -- Removed the thermal regulator and indeed does not open when put into boiling water. In addition found the bypass valve plastic piece not held up by it's spring -- on removal of the thermal regulator this plastic valve came down and out. Briefly ran the pump with heater...

Is a mastertemp as you surmised -- will investigate your suggestions -- THANKS. Will report any progress

Model 460738. Was assured the cycling was normal for a pool this small and heater this big -- now out of business.....Cycling now much more frequent but still eventually heats to set temp Sholdr

Our pentair400 natural gas heater (2000 gallon in-ground spa, filter pressure under 20PSI) lights, heats for 30-40 secs, shuts down as if the set temp has been reached (has not) then after 90 seconds the unit restarts, relights and repeats the cycle until set temp is reached. From new (2 years...