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

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Jandy 400,000 lx natural gas pool heater will not stay on. It kicks in for 10 seconds then shuts down.

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  • Jandy Master
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Bad or dirty flame sensor if just wired 120 volts reverse wires

Posted on Mar 05, 2016

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Posted on Jan 02, 2017

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SOURCE: Jandy, Lite 2 Pool heater wont kick in

3/4 pipe line will work and will keep heater from sooting up.

Posted on Feb 18, 2009

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SOURCE: low pressure reading on Pool Heater

I had this problem with ours last year. I replaced the water pressure switch and it began working fine. We later had a symptom that the blower would start but it would not ignite. The ignitor rod was corroded so I took it out and sanded it with some sandpaper---worked fine...until I dropped it trying to reinstall and it broke. Bought a new one and it works fine now.

Today's problem is related to the blower now.... it is always something, isn't it?!?

Posted on May 30, 2009

  • 128 Answers

SOURCE: Where is the Air Flow switch on a Jandy LX natural

The air flow switch is in the upper panel on the inside of the heater. There are gray hoses plugged into it.

Posted on Aug 23, 2009

  • 1 Answer

SOURCE: Message 'LOW PRESSURE' on my Jandy LX pool heater.

This isn't a solution, but a question after having the same problem and doing some troubleshooting. I removed the water pressure switch in the heater and turned on the pump and water flows nicely out of the copper tube for the water pressure switch. Next I replaced the pressure switch and removed the two wires and shorted them together, being as a switch is either on or off, shorted or open. I confirmed that the short is seen at the connector going into the control panel. I still have the low pressure light blinking. What now?

Posted on Jul 24, 2010

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1 Answer

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replace down towards bottom has two white wires its white ceramic if bad check gas pressure

May 26, 2012 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

My laars lx cycles on and off then shuts down. Error code AGR


How fast does it cycle? If it is quick like less than a minute the unit is not recognizing the flame. Could be bad flame sensor, bad ignition, low gas pressure, ground wire loose.

Mar 06, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Where is the Air Flow switch on a Jandy LX natural gas pool heater? And how do you change it?


The air flow switch is in the upper panel on the inside of the heater. There are gray hoses plugged into it.

Aug 16, 2009 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Pool heater will light then turns off


check gas pressure you should be getting about 10" water coloum

May 31, 2009 | Jandy Laars LX Pool Heater / 400,000 BTU /...

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