SOURCE: Hayward H250 giving me a "LO" error code and does not turn on.
9 times out of ten this means that you have a faulty water pressure switch. It could also be a limit switch, or air pressure switch. Make sure the filter is cleaned, and all valves are in the correct position. Once you are CERTAIN that water is flowing through the heater, you will need to short each individual component to find the faulty one.
SOURCE: Hayward H250 (millivolt) pilot won't stay lit
make sure the flame hits the thermo couple if so then replace it lows has them in the water heater section thermo couple gets hot makes millivolt signal then opens gas valve
SOURCE: Pilot light is lit, but heater will not fire
Make sure thermostat is set higher than water temperature. Make sure pump is running and water is flowing through unit. If gas valve is not opening then flame sensor or gas valve is bad.
SOURCE: Hayward H250 pool heater lights
if it is an electronic model you prob have a dirty flame sensor
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