elceser

You are sucking air on the inlet. I just had this issue. The piece of pipe threaded into the inlet of the basket strainer was not tight. I didn't find it until I closed the deep drain and skimmer suction valves. I closed the filter multiport valve and pressurized (SLIGHTLY....DON'T BURST ANYTHING!!!!) the pump, strainer and pipe with a garden hose to find the leak. I loosened a union in the strainer suction and tightened the strainer inlet fitting. All is now free of air infiltration. If not this fitting, some other is not tight/sealed. I use tefon tape. My installers used silicone caulk. I originally thought that the line from the skimmer to the basket strainer was clogged with debris. Use a silicone (stopcock) grease on the strainer lid o-ring. Note: As the filter clogs and the pressure goes up, the differential pressure across the pump (delta P) increases (it is sucking harder).

My story is the same. Approx. 8 years in service. Blown current inflow thermistor ($2.50 + shipping). I replaced this morning. The unit comes on, but goes out on low salt (2200). Pool store read 2600 ppm. I added enough for 400 ppm. Second store reads 3000 ppm. Is your salt reading OK? I'll tell you if it's hot, when I get it to stay on. I assume that it's going to be hot/warm to the touch. I understand that it's a thermistor and opens on the heat generated from high amp draw.