Question about Jandy Laars Lt 250,000 Btu Heater

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High Limit Swtiich message

I am getting a high limit switch message and the heater is not operating. Was working 2 days ago, nothing has happen to the system that should have changed anything. What does High limit switch mean

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  • 2 more comments 
  • pjdefelice Jan 03, 2009

    Our igniter fails to operate. Is there a way to clean or check it?.

  • Anonymous Jan 10, 2009

    What if you jump both High limits and are still getting this error. I'm also a technician but this one is driving me nuts. Pretty sure there is a clog in the exchange.

  • Miltonian May 16, 2009

    Had same problem with Service diagnostic message: Hi Limit Sw. When I pulled out both the 135 and 150 degree switches they appeared to have heavy white calcification after only 4 seasons. Tried cleaning then with isopropyl alcohol but did not work. Replaced with new ones one at a time at $37 cdn a pop each and after the new 150 was in the heater started working.



    Anyone know why I'm getting calcification and how to resolve it as don't want to fork out $80 every 4 years?



    Thanks

  • Anonymous Mar 31, 2014

    gas is on, control unit seems to work, when turned on to "spa" or "pool" nothing happens, ie no blower. after 2 or so minutes "high limit switch" error appears. I have checked and both switches are closed.

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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

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