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I have a Pentair Minimax CH, 200m natural gas heater. Pilot stays lit but sometimes the burners won't fire up and sometimes it does so it is intermitent. Wires all seem tight on terminals, I've been told to replace the pressure switch....Any thoughts or suggestions??

I started my conversion from Baqujunk on August 12, before finding this website. My pool store recommended the Zeneca method. I have a 12000 gallon oval AG Hayward 1.5, sand filter. They had me adjust the ph to 6.8 to 7 then shock with Sun-brite non chlorine shock 42% potassium...