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

1 Answer

Jandy Lars LT fans doe not turn on and error flashes hi limit

Posted by on

  • Scott Corey-reid Feb 13, 2014

    something caused the high limit to open. rare they fail all on there own unless wiring has been chewed



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An user who is expert in 3 categories / brands.

  • Jandy Master
  • 1,448 Answers

Check safety circuit and see if high limits are corroded also see if fusible links are tripped

Posted on Dec 01, 2014

  • Scott Corey-reid Dec 02, 2014

    the fan wont turn on because of the high limit fault from the last cycle. if the high limits are corroded then u should replace them. if the fusible link has opened then u had a roll out situation from clogged heat exchanger, downward draft, blockage in venting. also check internal bypass and thermal regulator to see if theyare seized. this will also cause a high limit fault. high limits open once water temp has reached 135 degrees. water can be boiling inside the headers



6 Suggested Answers

  • 2 Answers

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

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 128 Answers

SOURCE: Jandy LX250 LT Pool Heater High Limit Switch

Jump the High limit switch. If it fires the switch is bad

Posted on Aug 23, 2009

  • 246 Answers

SOURCE: getting error code 188E on Jandy Model LT Lite 2

press the arrow key for 10 sec this will reset the heater. if code replace control board, if not enter time date and set temptures for pool and spa

Posted on Oct 16, 2009

  • 1 Answer

SOURCE: where is the hi temp limit switch located?

where is the high temp limit switch located on my laars 44000 pool heater

Posted on Jun 03, 2010

  • 19 Answers

SOURCE: My jandy LT heater leaks water out of the

I have the 250000BTU version but I believe they are the same in this regard.

It is far more likely to be simply that the low pressure detection copper line sprung a leak or is loose and perhaps dripping onto the limit switches. In and around the same area as the 2 hi-limit plugs is a small flexible copper tube (like for a refrigerator water line). Check that connection for a leak. The other end of that pipe is in the wire chase above the front panel. If you need directions on how to open either panels just ask.

Posted on Sep 20, 2010

  • 5370 Answers

SOURCE: I have an inground pool

Hi limit switched are embedded in the header and trip when the water temperature is too high. Most of the time the cause is either a faulty sensor or poor flow thru the heater causing the exchanger to overheat. If you have a bypass plumbed into the water lines at the heater close it and see if the problem goes away. If not, you'll need to check the limit switches to see if they are faulty or if a condition exists causing them to trip.------------ Actually, when this light comes on, it's most likely the hi limit temp switch that's not working. You need to remove the low and high temp switches, clean them and refit it.Many of the times it solves the problem without replacing the switch.But if cleaning the switch is not helping then it has to be replaced. To locate them simply look on the outisde of the heater on the underside of the external water pipes that exit the right side. They are behind small silver plates with two screws in them.Remove the screws and switch will be out. ----- The hi limits are auto reset. pull the cover off of the side were the water connections are. Make sure the wires are connected to the sensors there are 2 . You can use a meter and ohm check the switches to make sure they are closed it not replace the open one. --------- This will help.Thanks.Helpmech.

Posted on Aug 29, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Jandy lt250 heater has air flow message

make sure 24 volts ac on both sides of pressure switch if not replace pressure switch or copper tube is plugged if only 10 or so volts will not keep gas valve open

Nov 21, 2012 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

Jandy lt400N L hi limit switch is showing. What can i do on my own to try and fix before calling service? Need details boys.....thanks :)

If you have a volt/ohm meter and you call Jandy technical support at 800-822-7933 number they may be help you resolve this issue.

Please let me know how this works out. Thank you.

Sep 02, 2011 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

What to replace when hi limit light is on

If you are getting hi limit errors, try checking the flow rate through the heater. Could be too slow... There should be a bypass valve plumbed to regulate the flow...Good luck

Jun 23, 2010 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

Jandy LT Pool/Spa Heater Will Not Heat

YOU SHOULD DIAL 1800 jandy LT help me out! the device the number or contact should be there .

Oct 03, 2009 | Jandy Lite2 LG400 Ceramic Compact Heater

1 Answer

Jandy LX250 LT Pool Heater High Limit Switch

Jump the High limit switch. If it fires the switch is bad

Jul 16, 2009 | Jandy LAARS LX250 - NATURAL GAS, DIGITAL...

1 Answer

Hi Limit Switch error

this may be for two reasons first the water is going to slow make sure filter is clean and either the water inlet plump incorect or the valve assembly is damage and need to be replace the high limit is letting you know the temp is getting to hot inside the heat exchanger

Jun 06, 2009 | Jandy Laars Lt 250,000 Btu Heater

3 Answers

Service light and Hi Limit light flash after I turn heater on for about 4 minutes. The heater is not working at all.

Hi there,

It seems that the problem was on the control board..

try unplugging the unit for an hour and better to clean it also.

if the above procedure was not corected the problem, this can be a problem on the contrrol board or ins switches.

Let me know, and update me how things get done..


Mar 27, 2009 | Jandy Laars Lt 400,000 Btu Heater

Not finding what you are looking for?
Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas Logo

Related Topics:

117 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jandy Pool & Spa Experts

David Spradling
David Spradling

Level 3 Expert

6465 Answers

Pj Kiley
Pj Kiley

Level 1 Expert

21 Answers

Bill Jordan

Level 2 Expert

372 Answers

Are you a Jandy Pool and Spa Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides