Hi all- I have a 20x40 in ground with a Hayward Proseries High Rate Sand filter (S244T2) and an H400FDN nat gas heater. Since the initial opening last year, the heater has never fired up unless the pump speed is at least 3. On speed 2, I get a “Low flow” reading from the heater.
Does this sound right? Should the heater be firing up on Speed 2?
Does this sound right? Should the heater be firing up on Speed 2?