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Thread: Spa Heater lights but won't stay lit.

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    Join Date
    Jun 2015
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    St. Louis, MO
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    2

    Spa Heater lights but won't stay lit.

    I have a 175000 BTU Laars Lite propane spa heater. It is about ten years old and was working fine last year. I winterized it by draining it (and the spa) last year. This spring when I filled it up and kicked it on, it won't stay lit. When the pump comes on, it clicks, I see the glow plug light up and it lights the propane as ot always did. But it only runs for about 10 seconds, and shuts off. Then after 20-30 seconds. it does it again, and repeats this until I turn off the pump. I can't figure out why it will light but not stay lit. I thought it might be the pressure switch or the pump not putting out enough pressure, or the filter being clogged. I cleaned the filter, and it didn't help. There seems to be plenty of water flow. I put a jumper on the pressure switch to see if it would stay on if the switch stayed connected. Nothing changed. I replaced the circuit board and thermometer board a couple of years ago, and put a new valve in. So the control systems are not as old as the heater. Any suggestions?

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    In the Industry

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    Jun 2015
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    Wildomar, California
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    Re: Spa Heater lights but won't stay lit.

    Try this in order; jump high limits, check internal bypass disk, propane flow, and broken ceramic on the glow plug.

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    In the Industry

    ps0303's Avatar
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    Jul 2011
    Location
    FL
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    Re: Spa Heater lights but won't stay lit.

    Usually a pressure switch won't behave like that. Sounds like a flame sensor to me. It's not seeing the unit lit and thus telling it try again.
    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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