Started cleaning out heater and found it under webs, exactly that,water pressure switch. Tightened everything up no leaks! Now just need to research wiring schematics to hook up the 2 loose wires from it. Still trying to figure out jandy valve function. Got recirculation running, water level at half skimmer and it starts sucking water so hard it gets air for a few chugs then goes back to normal. Air purges through pump then returns. Gets up to good pressure again , then it starts over.