Question about Jandy Laars Lt 250,000 Btu Heater

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Laars Lt spa heater service light

The Service light and temp sensor light is on. How do you reset the system after replacing the temp sensor?

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  • Jandy Master
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Replace temp sensor its by the plumbing inlets or mounted to top of heat exchange

Posted on Mar 05, 2016

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rcampsr
  • 90 Answers

SOURCE: Heater cycles on and of, pool/spa does not reach desired temp

hello, It sounds like you may not be getting circulation thru the heater. Make sure the valves are open to allow water to pass thru the heating system. Some systems use a bypass on the heater so there is not a lot of wear on the coil system in the heater. If it is not circulating it will get too hot and the safety shut down will occure. If you are getting water circulating thru the heater, then the thermocouple or auto start igniter system is not working correctly. It is trying to start and can't then recycles. If the burners are igniting on the startup and then shutting back down you may have a bad control unit or thermal sensor unit. Since the unit is gas have a professional service it for you. Good Luck, RAC

Posted on Apr 20, 2009

  • 2 Answers

SOURCE: Heater will only heat spa water to luke warm.

the water in my arctic spa hot tub took 2 weeks to get to 102 should it take that long ?

Posted on May 02, 2009

  • 1 Answer

SOURCE: My Laars Lite 2 will not ignite.

I figured it out on my own.

Posted on May 04, 2009

shuggie73
  • 1 Answer

SOURCE: Laars lite II Pool and spa Heater LG model

Bad pilot generator? Flow issue?

Posted on May 25, 2009

  • 10 Answers

SOURCE: I have a Jandy Laars LX Pool/Spa Heater...when I

If the unit is lighting then shutting off then repeating it isn't rectifying, means not sensing the flame. May have a bad flame sensor or ignition control. I'm guessing your AGS is indicated on the GUI also.

Posted on Mar 07, 2010

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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I have a laars jandy 250 lt gas pool heater that only heats luke warm. The heater cycles normally then heats up but stops before reaching operating temp. No service lights and thermal switches are g


I do not have a handy but mine has a temperature setting at the heater and one on the remote. it is possible that one of the settings is low. the pool or spa temp is sensed at the heater and with the water temp located in the pool lines. so both the control board and the heater are sensing the water temperature.

Oct 09, 2014 | Jandy Laars Lt 250,000 Btu Heater

1 Answer

Laars LX 250 AGS Service error. Burners ignite the go out.


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Nov 17, 2012 | Jandy Laars Lt 250,000 Btu Heater

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Laars LT - "red" light


means calling for heat if heater doesn't come on check safety circuits

Feb 12, 2011 | Jandy Laars LX Pool Heater / 400,000 BTU /...

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Service light and ags light comes on after a minute or two


I had this problem. Jandy ended up replacing the burner from day 1 with the heater (LT400 propane). It was a manufacturing defect. Of course it took 5 trips from the "warranty" company to not fix it before they finally punted to Jandy. Then, there's only one Jandy service rep from VA to ME (I'm in PA).

Jan 27, 2010 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

I have to reset the heater several times before it lights. I get the "service" and "AGS" lightgs flashing after it tried to light. Once it lights it runs fine


AGS MEANS TH EHEATER IS NOT FIRING CHECK YOUR GAS VALVE IF OPEN THAN CLEAN THE ORIFICES WHERE THE GAS COMES OUT AT THE GAS MANIFOLD

Oct 30, 2009 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

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

Jun 13, 2009 | Jandy Laars Lt 250,000 Btu Heater

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