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Thread: Hayward H250 Lo Nox wont stay lit, IF code

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    Hayward H250 Lo Nox wont stay lit, IF code

    Just opened the pool yesterday. Filled it up last night, ran it through the main drain all night after adding salt and switched it to the skimmer this morning. This will be the heater's third season. Anyhow, it went through it's normal cycling, with the clicking etc. Faint smell of gas. I got the usual 'woomph' when it lit and then it went out 2-3 seconds later. After three times I got the IF code. The first two seasons, it lit first time, every time. Any ideas this time?

    Does the 'woomph' mean gas is getting to the heater?
    16 X 32 Vinyl. Hayward aqua rite salt system, T -15 cell. Hayward H250 gas heater, Hayward 1HP superpump.

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Hayward H250 Lo Nox wont stay lit, IF code

    Yes, a 'woomph' mean gas is getting to the heater.

    Most likely it just needs to be cleaned out inside a little bit. Debris blocking the air tubes can cause the sensor to read a problem and the heater to shut down. Often rodents get inside and add some nesting material, or leaves blow in, or something is blocking the air flow enough to keep the safety sensors from being happy.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Hayward H250 Lo Nox wont stay lit, IF code

    Is that something I need to 'call a guy' for or is it something a relatively 'useless around the house guy' can do himself? It it more involved than taking the front panel off?
    16 X 32 Vinyl. Hayward aqua rite salt system, T -15 cell. Hayward H250 gas heater, Hayward 1HP superpump.

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    Re: Hayward H250 Lo Nox wont stay lit, IF code

    Got home yesterday and it was working. The pool company had sent over their 'gas guy'. Not sure what he did.
    16 X 32 Vinyl. Hayward aqua rite salt system, T -15 cell. Hayward H250 gas heater, Hayward 1HP superpump.

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