Pool and Spa
Questions about Pool Repair? Ask an Expert Online.
That is pretty easy. I would start by testing voltage at the back of the circulation pump feeding water through heater and verify 220 volts, if power is there then pump is bad and replace. If pump is flowing water through heater then it is flow switch test by finding the flow switch next to the heater and follow wires back to circuit board and find where the wire plugs into board, jump across the wires or pins to make board think the switch closed if heater indicator light goes on for heat then flow switch is bad and replace.