Question about Jandy Laars Lt 250,000 Btu Heater

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Heater doesn't heat all the way the spa - Jandy Laars Lt 250,000 Btu Heater

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  • Jandy Master
  • 3,543 Answers

If aqua link turn heater all the way up then see if works ok

Posted on Apr 29, 2016

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: SPA Filter on while Spa is Heating

you have one jandy valve ( the suction valve in front of the pump) that is not working right when you press spa mode. have someone watch the valves to see if they move when you press spa mode and heat inside the house. if the one in front of the pump does not move and the switch is in operating mode then that valve is bad and will have to be replaced.

Posted on Aug 06, 2009

  • 990 Answers

SOURCE: I have an aqualink rs

If the Aqualink is calling for heat then the problem is most likley in the heater. Without more information I can't tell you much more but if nothing has changed in the last couple of days. Before you call anyone be sure to clean your filter and baskets. The heater need a set amount of pressure to run and if things are dirty it won't get that pressure. Good luck.

Posted on Mar 13, 2010

Testimonial: "The burner is lighting but won't stay on, more than a minute or so. I tend to think the problem is water flow, like you say. Thanks...DC"

Daniel S
  • 4323 Answers

SOURCE: The spa heater says the


1. Turn off the power to both the pool/spa control system and the heater unit.
2. Remove the front panel door from the front of the heater to access the raceway.
3. Run the wires from the pool/spa control system through the opening, Thermostat is located on the lower right or left hand side of the heater.
Please check this link for more details---
Jandy LXI 300 POOL HEATER Manual

Hope this helps... If it does please do not forget to accept the solution or post back for assistance.


Posted on Aug 21, 2010

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For a more definitive answer I recommend you call the Jandy technical supportat 800-822-7933 and they should be able to help you figure this issue out.

I hope this helps.

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I have a Hayward H100IH pool heater. With the pool filter on the heater starts to heat up when I turn up the thermostat, but the heat turns off after a few seconds.

That doesn't sound fun. You could call the Hayward technical support number at 908-355-7995 and they might be able to figure this out. I hope this helps.

Please vote for this answer. Thank you.

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You might call the Hayward technical support number at 908-355-7995, I hope this helps.

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I want to heat the pool from the spa. I have the spa and spa heat on but the spillover wont come on when I have the spa on. When I turn the spa off the heat goes off. What do I do

When your system is put into Spa mode the system draws water from the spa only to the heater to keep the spa at temp, this is why the overflow doesn't work and why you can not heat the pool in spa mode. If you could heat the pool this way it would take a very long time, since the spa is smaller then the pool. You can heat the pool and spa at the same time in pool mode. Water is pulled from the pool, heated and goes back into the pool and spa.


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