Question about Jandy Laars Lt 400,000 Btu Heater
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Posted on Jan 02, 2017
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
Check your high limit switches. These can be found in the header. There will be two, and they are right next to eachother. You may pull them out and they may look like they are corroded or have gritty stuff on them. If that is the case, they will need to be replaced. However, this is usually an indication that the stud sensors in the header are corroded and the new sensors switches will again go bad. Unfortunately, the stud sensors are brass little posts, that were poorly made on some jandy heaters. They are available on a part, but near impossible to replace. So, it means you will likely need to replace the entire header or keep on replacing the high limit switches. HTH
Posted on May 30, 2010
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