Speedcanuck

did anyone solve this? im having identical issues. note that the pump stops as there is no call to heat ( the flow sensor stopped the heat with the FLO status) and no call for filtering, or manual pump turned on. what does the in.flow sensor do? is it just simple pressure? overheating or freezing of water can cause error in the sensor, but also do not want to spend $200 for a heater that works fine for the $15 pressure(?) switch.