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I don't believe mine has a small circ pump. I see 2 similar size pumps (one for #1 on the display and the other for #2). Last night during my test, I turned the heat down as low as it would go so I would limit what I was testing. Here is what I did8:41 turn power on, Heater turned off, Filter removed, Pump 2 off, Pump 1 on low. 9:01 pump 1 still run on low. 9:13 pump 1 moves to high9:30 pump 1 cuts off, FL1 code shows on display. I thought I read where the pressure switch was adjustable. Honestly don't know where mine is.