Question about Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas

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Heating is limited

With the system set on 104 the unit will only heat the spa to 72 degrees. There are no error codes on the system. What should I check?

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  • Contributor
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The system has one temp but the heater temp should be turned all the way up outside on the unit as well

Posted on Jan 03, 2014

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Posted on Jan 02, 2017

PartsCenter
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SOURCE: can you heat the pool and spa at the same time?

Here is a link to the owners manual and users guide.
Aqualink RS24

Posted on Mar 04, 2009

  • 61 Answers

SOURCE: Spa only gets to about 90 deg

For a quick fix you could swap out the air and water temp sensors. They should be exactly the same.

Posted on Apr 12, 2009

  • 990 Answers

SOURCE: I have a Jandy Lite

This sounds very much like spider webs in the gas orfaces. If you shut the power off and remove the wires to the gas valve then shut the gas down and remove the fed pipe from the gas valve you should be able to pull the burner tray out of the heater. Now if you remove the burners you should be able to remove the brass orfaces connected to the main gas feed pipe. If you use an air hose or a can of compressed air you can blow this out now. Now take the orfaces you removed and clean them with a tooth pick or a small piece of wire. The webs will look like small cotton balls or lint. They don't stop the gas they just slow it or disperse it and keep it from firing clean and evenly.
At this point you can reassemble the tray and install. This should fix your problem.

Posted on Nov 14, 2010

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Spa was below temp, now it heats and won't shut off.


Is your spa overheating, heating up past 104 degrees?
If so, you have a contactor (or relay) stuck shut and the spa should go into OH at 108 degrees.
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If your hot tub is only heating to 104 or what ever temp you have it set at and the motor runs 24 hours a day there are a couple of things you'll want to check.
First, make sure that you do not have the pump set to run 24 hours a day.
Second, you'll want to see if the pump icon is lit up on the control panel. You will want to check to see if the icon is on while the spa is supposed to be resting. During filter cycles the icon will be lit. If you are not in a filter cycle and the pump is on while the icon light is off, you have a stuck contactor (relay). The relays can be found online for less then a couple of dollars.
If you have any more questions feel free to ask.

Feb 23, 2015 | Dream Maker Spas Dream Maker Spa - X500...

1 Answer

Our hot tub temp keeps dropping daily into the 90's temp when it is set at 104 degrees. When we turn the high speed blower on, it seems this is the only way we can get the temp back up to the


calcium will stick to heating element 1st and make it less able to heat water , eventually it will consume the entire surface and insulate the water from touching it and warming it and finally overheat it and cause burnout , high calcium (limestone) is usually a condition that occurs when filling via a well or stream , consider getting a load of pre softened water from a municipal water system , there should be a list of haulers in your area that can provide this service

Jan 08, 2015 | Pool & Spa

1 Answer

Heats to only 72 degrees


make sure heater is set to 104 degrees aqua link controls temp

Jan 03, 2014 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Heats to 72 degrees


try setting heater all the way to 104 the aqualink should control the heat

Jan 03, 2014 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

My apollo spa galaxy II D20Nj will not heat past 85 can you tell me what I should do or part to get to fix this serial #BSJLJEG


make sure spa setting is at 104 degrees if at 104 degrees see control system if ok change temp sensor either in heater or control unit

Dec 07, 2013 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

I have an Aqualink system, spa set to 104, it will heat to 94 and stay there, temp sensor is working, took water sensor out of line, plugged line, assumed heater would just keep heating, it did heat a


The heater may be wired just fine. The aqualink uses its water temp sensor to call for heat based on what you've set the thermostat to on the aqualink. However, most heaters have built in thermostats that over-ride the aqualink. Those thermostats come factory defaulted not to go over 94. Check your heaters manual on how to adjust the thermostat on the heater. Your heater should have its thermostats set to 104 and the aqualink will control the actual temp of the water by calling for heat based on what you've set the thermostat on the aqualink for. Hope this helps.

Oct 16, 2012 | Jandy Aqualink Rs4 One Touch Control...

1 Answer

SPA WILL NOT HEAT PAST 94 DEGREES. i HAVE IT SET TO 103 AND IT HAS NOT MOVED PAST 94 DEGREES FOR OVER 1 HOUR EXACTLY WHAT BUTTONS SHOULD BE LIT ? IN OTHER WORDS IS THE AIR BLOWER LIGHT SUPPOSED TO BE...


if hook up to the firemans switch turn heater all the way to 104 degrees if using 4 pin connector for aqua link to heater set spa temp to 104 and make sure on aqualink spa heat is enabled and 104 degrees

Nov 30, 2010 | Jandy Aqualink Rs4 One Touch Control...

1 Answer

Heater reads spa water 15 degrees higher than it is


if a 3 wire system put pool at temp desired and spa at 104 if 2 wire to firemans switch run heater all the way up to 104 the system will control the temp

Feb 22, 2010 | Jandy AquaLink RS2/6 All Button Dual...

1 Answer

HI I have my hot tub at 104 but it will only heat up to about 80 degrees. what is my problem


If its set at 104, but only heats to around 80 degrees, then your heater is not working. Either the heating element is bad, or the pressure switch is not closing. The reason why the water heats up to 80 degrees, is from the friction caused by the mechanical shaft seal when the pump is running. Either way, you should really have it checked by a qualified spa technician. It is not something that the average spa owner can normally repair themselves. Sorry.

Sep 27, 2009 | Dream Maker Spas Dream Maker Ez Spa Hot...

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