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Thread: Jandy Lite 2 millivolt heater not starting

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    gtemkin's Avatar
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    Jandy Lite 2 millivolt heater not starting

    Every season my Jandy Lite 2 millivolt heater is a bear to start. Sometimes I find something wrong like a bad pressure switch or a low output generator. But even after replacing those parts, and with everything, measuring fine through the whole safety and control loop, on the first startup of the year I never can get the main burner to fire without waiting long periods of time.

    Some years I do nothing other than leave it switched on, and after an hour or so, suddenly it fires and is fine for the rest of the season, restarting many many times without delay.

    Today was the first day I went to fire the heater this year. Lit the pilot. Flipped the temperature control switch to ON and set the potentiometer to max value. Waited. Nothing.

    Went through the entire Jandy troubleshooting procedure and found 244 millivolts (control switch on) at all points along the safety and control circuit (between PP and every test point). With switch off, generator measures 511 millivolts between PP and PP/TH. Those values meet the 220 and 500 minimums from the manual.

    I jumpered between the PP and TH terminals to try and bypass everything. Still won't fire. Is this all pointing towards a bad gas valve? Tapping on it with a small hammer doesn't seem to help.
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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    Re: Jandy Lite 2 millivolt heater not starting

    As long as you have the millivolts at 490+ and the pilot stays lit, I would have to point a finger at the gas valve. If you jumpered the gas valve as you say and nothing happened, very possible a bad gas valve.

    Maybe it's time to retire the beast and get something new.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    gtemkin's Avatar
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    Jandy Lite 2 millivolt heater not starting

    Gosh, I don't know what I'd do with myself not having to futz with this thing every year! Thanks for confirming my suspicions.
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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    gtemkin's Avatar
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    Re: Jandy Lite 2 millivolt heater not starting

    4-1/2 hours later, valve decides to actuate and I have heat. Probably will be fine for the rest of the season. Worlds slowest actuating gas valve!
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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