SOURCE: I have a Hayward H series spa/pool heater. It will not light.
IF stands for ignition failure, one possible cause is that the two sparker prongs are not spaced properly, i have seen this before several times. The correct distance for them to be spaced apart is the width of two quarters side by side... not like this....OO, the other way so the are flat. To access that you have to take out the heat exchanger, which requires unhooking high limit switches in the back, unhooking the pressure switch, thermostat wire, and plumbing...just remember where everything goes. Before you do that though check this simple thing...there are a number of brass orifices that shout gas to the burners, use a 7/16 wrench to take off the one that is to the extreme left, which is on the igniter side of the heater, inspect the orifice to see if there is blockage, like a spider web or something. If it is blocked, clean it out and also look down the burner itself to see if it is free of blockage. And because we all make simple mistakes.......make sure the gas is on.
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 pool heater lights
if it is an electronic model you prob have a dirty flame sensor
SOURCE: Hayward H250 FDP Pool heater won't stay lite
sounds like a flame sensor.remove ignitor assembly and clean with fine emory cloth or steel wool.when properly cleaned it should feel smooth for entire length of sensor
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