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Jandy lx400 wiring diagram

Instructions on how to connect a high limit harness

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  • Jandy Master
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If talking about firemans switch take off jumper white wires then replace with wires to the system contoller to heater

Posted on Nov 06, 2014

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Posted on Jan 02, 2017

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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

  • 1378 Answers

SOURCE: How much time would a

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It should only take a few minutes to actually replace the part; quite a bit longer to diagnose the problem depending on the way the switch failed and overall condition of the heater. It would not be unreasonable to get a bill for an hour to troubleshoot and repair a heater with a defective high limit switch.


Posted on Sep 21, 2010

  • 990 Answers

SOURCE: my jandy lxi say's fault high limit

Yes you can jump past the limit switches one at a time. That will tell you which one is bad. Then you will need to replace it.

Posted on Sep 27, 2010

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Lx400 pool heater gets very hot on outside of unit is this ok

check gas pressure if too high it will get too hot or if too low it will soot up then overheat

Jul 07, 2014 | Jandy Laars Lt 400,000 Btu Heater


Laars LX400 Manual Download

Laars LX400 Installation & Operation Manual

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



Have you lost your Users Manual / Owner's Guide for your Laars LX400 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 LX400 Pool Heater guide.

I hope that helps.

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

2 Answers

Jandy Lite 2 Pool Heater won't stay lit

This could be a number of things, high limit switch, temp sensor or clogged burners. If the heater does not get much use cob webs could be the culprit. To test the high limit switches you can disconnect them temporarily and use a jumper wire , if it fires and stays lit then you have found your problem. Just disconnect the 2 wires , and use a separate wire to connect the two together bypassing the switch. This is a safety feature and should only be jumped as a diagnostic tool and not left to operate this way.

Dec 06, 2013 | Jandy Pool & Spa

1 Answer


check hi limits by plumbing can jump to check

Jan 17, 2012 | Jandy LAARS LX400 - NATURAL GAS, DIGITAL...

1 Answer

I have a Jandy LX400 that won't ignite. Check ohms on ignitor and the0y are around 70. Check voltage at gas valve and it is 10vac vs. 24vac. Any ideas?

check wiring 220 vs 120 volt you might have to change wires if wired 120 volt change wires on ignitor to 120 volt see schematic inside front cover

Feb 08, 2010 | Jandy Laars Lx 400,000 Btu Heater

1 Answer

I get a message saying Hi Lim SW when trying to heat my spa. What does this mean

Temp control failure (thermostat) high limit is safety to prevent over heat.

Jul 26, 2009 | Jandy LAARS LX400 - NATURAL GAS, DIGITAL...

1 Answer

I get a message saying Hi Lim SW when trying to heat my spa. What does this mean?

hi limit switch heating unit getting too hot what type of heater are you using

May 09, 2009 | Jandy LAARS LX400 - NATURAL GAS, DIGITAL...

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