Question about Jandy Laars Lite2 Ld 400,000 Btu Heater

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I have a ten year old laars lite 2 LD 400000 heater. It will start but then the flame goes our after 30 seconds. I have checked water circulations and is OK. What could be wrong?

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  • Jandy Master
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Clean flame sensor

Posted on Mar 05, 2016

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4 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Laars lite II Pool and spa Heater LG model

Bad pilot generator? Flow issue?

Posted on May 25, 2009

flacooo1
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SOURCE: Laars Lt heater will not start- pressure switch light

it is time to check your filter make sure is not dirty and if your filter is clean and still doing this then the problem can be with one of the safety sensors they do have 2 hight limit switch located in the heater heather they re round with two wires on each one turn power off to heater and get a voltemer reader and check the hight limits for continuty they should read zero on your metter it can be your temp sensor heaters are so complicated that it is always good to have a pool tech service it I was a pool tech in california but now I am located in georgia

Posted on Jun 15, 2009

john224
  • 1378 Answers

SOURCE: Laars lite 2 ld will

Thank you for posting your question here on Fixya.com.


First you will need to get a hold of a digital or analog multimeter and set it for the lowest range of Ohms you can. Your safety circuit is a string of several switches all strung together in a row with the gas valve at the end and the beginning of said string. Any one switch being open or a bad connection anywhere in the circuit and the heater will not fire.

You task is to remove one end of the circuit from the valves TH or TT post and put one end of you meter on that wire and the other end on the TH/PP terminal. It will likely read infinite resistance. Leave one meter lead where it is and remove the other. Follow the circuit from the connected lead up to the first switch. Check continuity from the lead left connected to both sides of the switch. If there is continuity to both sides the switch is fine. Keep moving from switch to switch until you find the bad switch or connection. There may be more than one. When the circuit is working properly and there is nothing within the heater to cause it to shut off you should have 5 ohms or less across the entire circuit. Once you get the reading to that level the heater will work as it should

If you are not familiar with the process I described you would be better served hiring a pool technician to perform this repair as you can cause significant damage to the heater if you do not repair it properly.


If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


John

Posted on Mar 19, 2011

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