pentair heater

Looking for help my diagnosing my Pentair MasterTemp heater. We have a spa/pool combo with the Pentair 4 button spa side controller. All has been working for 10 years. But when the button is pressed at the spa which changes the valves to spa circulate, pump on, heater on, is pressed...the...

Hi, Last year I bought a pentair 400k btu pool heater. I also got my 19k gallon in-ground gunite pool replastered. Hindsight what it is, I probably should not have gotten the heater when replastering, as it was difficult to maintain the pH (it was often 7.8-8.4 last summer). And for the first...