After having had a 1" flow sensor installed on my main return pump for about 6 months I got an alert that flow had dropped to 0. Pump was still a pumpin' but sensor was not a readin'. Took the sensor out of the circuit - no obvious obstruction, but the paddle wheel was 'locked'. I had to completely take the sensor apart and clean out the spindle holes in order to get it to work again. Maybe missed it but clearly these things require periodic cleaning.
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