Pool and Spa
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You may have a blockage in the low flo pump. You will need to remove the pump and open the front housing to expose the impeller to see if there is a clog in there that is restricting flow. From there check that your flow switch/Pressure switch on the heater is good, this has two wires off the top of the switch going to the board you can jump these wires out when the red light is flashing to see if it starts working again if so replace the switch.