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had gas co out to test for leaks and found none in addition 7 inches of water column. getting our head around the fact that a 5 year old heater and a brand new one show same problem. you are right it has to be something in common. the sand filter is running at 24 psi, the variflow valve? could...

opened pool pump started heater blower comes on but will not fire. goes to lockout, no service lights under hood sta-rite 400. checked all item switches on manifold had 3 companies come to check. no luck so figured old mech so I purchased another 400 same problem. 7" water column and no leaks on...

pentair 400 n/g unit will not reach set point on spa set at 104, tried using pool setting also no luck. thanks Doug