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Laars lx400 blower does not come on

Gas is on, control panel seems to be working, when turned on nothing happens, no blower, after 2 or so minutes high limit switch error comes on. I have checked both switches and and both are closed.

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  • John Seifrick
    John Seifrick Mar 31, 2014

    Both limit switches test to be closed, zero impedance. My understanding is that the blower should come on first, then ignition. The blower does not come on. . . nor is there ignition which I would not expect since the blower is not on. Seems strange that the limit switch error occurs over 2 minutes later when the heater is not heating.

  • John Seifrick
    John Seifrick Mar 31, 2014

    I need some advise on how to test the blower circuit as a first step instead of replacing stuff as a diagnostic.

  • John Seifrick
    John Seifrick Mar 31, 2014

    Schematic indicates a "manual reset high limit switch" and a "fusible link". Any clue as to where these are located?

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  • Master
  • 1,448 Answers

Check filters or pressure switch sounds like safety switch isnt working

Posted on May 08, 2014

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Posted on Jan 02, 2017

  • 22 Answers

SOURCE: High Limit Swtiich message

The high limit switch is one part of a safety loop circuit that must work before a heater can fire. It's purpose is to ensure tha tthe heater will shut off in the event of a thermostat failure or if the internal core gets too hot due to a lack of water flow. If the switch is failing, it needs replaced. There are 2 so you can replace both or make an attempt to determine which one is bad. It is best to replace the pair.

Posted on Dec 21, 2008

jharwell668
  • 640 Answers

SOURCE: Laars LX400P pool heater Hi Limit Switch light is on? ???Fix?

This indicator normally means that your water temperature in the pool heater exceeds the internal limit. The corrosion should not be causing this problem. Since the high temperatures can be dangerous, you will probably have to contact a pool professional to service the machine.

Posted on Aug 12, 2010

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Laars LX400 Installation & Operation Manual

Models: LX250NL / LX250PL / LX400NL / LX400PL
Models: LT250NL / LT250P / LT400NL / LT400P

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I hope that helps.

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