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Thread: Pool Heater

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    Pool Heater

    Please Help! I have a hayward H400 Milivolt heater. 4 years old. Pilot light comes on but the unit will not fire??? Spider webs?? How hard is it to remove the burners and clean the unit?? Thanks!!
    IG 24,000 vinyl pool

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    krcossin's Avatar
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    May 2007
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    I don't have your heater, but I also experienced no fire condition. I had to disassemble the gas fitting after the shut off valve/prior to the heater. Open it up to purge the line, fired right up.
    2007 - 24' AG Doughboy Desert Spring dished 1.5', with DB Power Pak II-1hp pump, DB Sequel I Plus DE, Hayward H-Series Heater 100k + 8gal LQ.

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    Re: Pool Heater

    Quote Originally Posted by jholling
    Please Help! I have a hayward H400 Milivolt heater. 4 years old. Pilot light comes on but the unit will not fire??? Spider webs?? How hard is it to remove the burners and clean the unit?? Thanks!!
    It could be spider webs but it could also be any of the safety devices (pressure switch, hi limit) holding the burners off.

    Removing the burners is involved by not difficult. I pull my burners every year to clear spider webs. Takes about an hour.

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    Thanks for all of the help! I cleaned out the orifices and let the gas line purge, it has about a 80' run and has been shut off since october. Fired right up!!!
    IG 24,000 vinyl pool

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    In the Industry
    duraleigh's Avatar
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    krcossin & Denali,

    Please move to the head of the class and pick up your gold stars!! Great advice!
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
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    I have an older (25 years) Laars gas heater, but I have never cleaned any orifices or purged the line. And the heater typically goes most of the winter without being turned on.

    What is involved in orifice cleaning and line purging. The previous poster mentioned removing the burners. I think I can do this, but then how do you get the gas flowing through the gas valve?

    Titanium
    24,000 gallon inground freeform pool/spa circa 1983 (113 ft perimeter, 625 sq ft) with 350 gallon attached spill-over spa
    2007 2 HP, three-phase Hayward TriStar pump which is powered by an Ikeric VS-200 variable speed drive system
    1983 Laars XE Pool/Spa Heater Type ES 400,000 BTU, 1998 Hayward Super Star-Clear C-4000 cartridge filter (400 sq ft, 4 separate cartridges)
    1998 Polaris 380 pressure-side cleaner w/ 3/4 HP booster pump
    One skimmer :( and one PoolSkim :), One Supervision Galaxy LED pool lamp, Second story solar panels
    Hayward/GoldLine AquaLogic PS4 (replaced 1983 vintage dual circuit Intermatic timer)

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    Quote Originally Posted by Titanium
    I have an older (25 years) Laars gas heater, but I have never cleaned any orifices or purged the line. And the heater typically goes most of the winter without being turned on.

    What is involved in orifice cleaning and line purging. The previous poster mentioned removing the burners. I think I can do this, but then how do you get the gas flowing through the gas valve?

    Titanium

    If you decide to pull the burners you can purge the line at the same time. To get the burners out you need to undo the union in the gas line. This is either in the heater to the left of the gas valve or just outside the heater.

    On the Laars there are some screws holding the burner assembly in place. If you're lucky someone has already removed them and not bothered to put them back. They can be a pain to get out.

    Once the burner assembly is out, you remove each burner. They pull right out. You will see a burner orifice for each burner. They thread out. Once out you can see if there are webs in there. Clean them out and reinstall.

    For purging you don't need it flowing through the gas valve. Purging out of the union you have open is usually fine.

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