Question about Jandy Laars Lt 400,000 Btu Heater

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Jandy LT400 Pool Heater - heater shuts off before it gets hot

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  • mremlinger May 11, 2010

    LT 400 Jandy Pool Heater - Does not heat up my spa - it lights and runs for about 20 minutes and then shuts off. i have checked the flame sensor and the brass fitting 4 from the right for blockage. What is the next thing to do/check?

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How old or new is your heater....because it sounds like the thermal fuse is bad.

Posted on May 11, 2010

  • Greg Bernett
    Greg Bernett May 19, 2010

    Okay, one thing is, the heater should not be used to maintain water temperatures at or below 70F. This will damage the heater.



    Can you tell me if you have a flashing "SERVICE" message displayed?

  • Greg Bernett
    Greg Bernett May 19, 2010

    Another question.....do you have the owner's manual?

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Hi, i would suggest you hire a local pool heater technician to diagnose the problem for you. Any decent tech can ID the problem and likely have it fixed in an hour or so and it could be something as simple as a faulty thermostat which with parts and labor would be under $200; far less than a control board and a fraction of the cost of a new unit. Questions to ask a potential tech would be how much an hour? Is there a service call or travel fee? Do you carry replacement parts on your truck or stock them nearby? How long do you guarantee your work?

Take care

Posted on May 11, 2010

  • Shehu Pro
    Shehu Pro May 11, 2010

    Hi, check the thermostat and the control board...

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Laars LT400 Manual Download


Laars LT400 Installation & Operation Manual

Models: LX250NL / LX250PL / LX400NL / LX400PL
Models: LT250NL / LT250P / LT400NL / LT400P

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Have you lost your Users Manual / Owner's Guide for your Laars LT400 Pool Heater?

Would you like a digital copy of the Installation / Operation Manual for easy searching of terms and quick reference?

Click here to download your pdf version of the Laars LT400 Pool Heater guide.

I hope that helps.

on Apr 19, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

I have Jandy/Zodiac LRZE legacy heater and Jandy RS6 controller. When hooked up to RS6 and there is a call for pool heat the heater ignites but shuts off in about 30 seconds. When I disable the TSAT...


check your dip switches on the inside panel of the aqualink if you still cannot get it to work i would use the pool to 1 wire of a new wire you will run to the heater then 2nd wire to com then on the on the PCB board going to pins 1 and 2 of the big plug then turn heater all the way up when heater button is pushed or activated it will turn heater on and off

Aug 05, 2013 | Jandy Legacy LRZ Heater

1 Answer

I have a Jandy LT400 heater that is 6 years old. The burners light but the flame shoots out of the burner tubes and does not stay lit above the burners. It will then shut off and do the cycle 3 times. I...


Whatever is happening, it sure sounds like a gas issue. The fact that it is trying to fire eliminates everything else.
You may want to check the inside of the tubes and remove the jet nozzles to make sure they are all clear. It is common for spiders (webs) and other small bugs to get into the path of the gas. Even a tiny blockage can keep the gas from flowing properly and cause a failure. I hope that's all it is. Good luck.

Jan 28, 2013 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Jandy LT400 ES1 light blinking because vent on top was blocked while unit was running


The manual manual says to check the flue (blower motor). The ES1 fault probably means emergency shutdown 1. When the flue was blocked it likely overheated something like the blower motor or some safety device and the system board is now detecting this problem and is indicating ES1.

If one of my customers had this issue then I would be prepared to open the heater and probe locations in the heater with a volt/ohm meter while on the phone with Jandy's technical support number, 800-822-7933. They are likely to help you diagnose this issue and recommend a repair.

Please let me know how this works. Thank you.

Sep 01, 2011 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

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

Heater keeps going off


check the valve assembly may be bad if not the heat exchanger is plug nothing you can do about this

Jul 21, 2009 | Jandy Laars Lx 400,000 Btu Heater

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