where is high limit switch located on jandy laars pool heaters

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.

This is the image of high limit switch

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Also click this link directly to view the limit switch:---

http://www.parts4heating.com/Laars-R0061300-Limit-Switch-p/r0061300.htm

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See this image, and see part number 29 and 28, on the right side this are high limit switch:---