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Thread: LAARS LX400N-L - HI LIM SW Error - Replaced Switches and Harness

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    LAARS LX400N-L - HI LIM SW Error - Replaced Switches and Harness

    Hi Guys, my heater will run for 15 minutes and then throw the HI LIM SW Error. I replaced the High Limit Switches twice and also just replaced the harness and still same problem.

    I don't seem to have a flow problem. Filters are clean. Everything else on the pool is working.

    Thoughts on where to go next with this one..

    Thanks

    Gary


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    Re: LAARS LX400N-L - HI LIM SW Error - Replaced Switches and Harness

    The next stop is whether or not the board they are connected to is bad. How would you know? Replace the board or call a service tech company out and let them swap out parts to find the issue.
    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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    Re: LAARS LX400N-L - HI LIM SW Error - Replaced Switches and Harness

    Thanks Paul. There is nothing else that is causing it to overheat?

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    Re: LAARS LX400N-L - HI LIM SW Error - Replaced Switches and Harness

    How old is the unit?

    Bad bypass spring, obstructed flow of water, or blower motor is not exhausting the heat correctly.
    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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    Re: LAARS LX400N-L - HI LIM SW Error - Replaced Switches and Harness

    Thanks Paul. The heater is 10 years old. I hear the blower motor running.

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    Re: LAARS LX400N-L - HI LIM SW Error - Replaced Switches and Harness

    Solved. I closed the external heater bypass valve 50%, directing more water through the heater. Now, no more Hi Lim SW error.

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    Re: LAARS LX400N-L - HI LIM SW Error - Replaced Switches and Harness

    Quote Originally Posted by garywi View Post
    Solved. I closed the external heater bypass valve 50%, directing more water through the heater. Now, no more Hi Lim SW error.
    Yes that would cause not enough water flow thru the unit and thus allowing it to over heat.
    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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    Re: LAARS LX400N-L - HI LIM SW Error - Replaced Switches and Harness

    Ideally, you should flow as much water as possible thru the heater. This way it will pull the max BTU's from the heat source and return them to the pool.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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