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Hayward h400 (electronic ignition) does not light. Jumped our pressure & limiter switches. Change gas valve. Still not lighting. Have plenty of spark. Help!!

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If you have a multi-meter check for 24 vac between OR & W at the board or on the gas valve (OR & W are the 2 wires that go to the gas valve). Check the voltage while the igniter is sparking.

Posted on Mar 23, 2010


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Hayward H400 heater won't light and service light comes on. Also gives a code on screen "AO". I can't find in the owner's manual what that means. It is the electronic ignition model.

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Hayward H400 will not ignite

Gas valve.
Gas valves will often stick in the closed position especially after sitting dormant for a period of time.
if you want the posibility of one more season, You can try to tap on the bottom ans side of the valve with handle of a screw driver while it tries to ignite. Note: This is a technician trick, most manufacturers will not approve in fear you are so lacking in common sense you will go out and beat the valve with a hammer, then sue them when it cracks the metal valve leaking gas while you smoke a cigar ultimately relocating your heater on top of the neighbors please don't do that. BUT, If the valve opens and heater fires with a few love taps try it a couple more times to see if it will work on its own. It will likely continue to work if so.
You will likely need that gas valve next year anyway.

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