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Jandy lx400n-lcp pool heater high switch connections?

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  • Jandy Master
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Hi switch connections at plumbing hi limits if not looking for that check for pressure switch

Posted on Apr 29, 2016

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Posted on Jan 02, 2017

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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

  • 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

  • 21 Answers

SOURCE: FL 4 error, Jandy Lite 2 pool heater

I believe you may have a draft restriction and this may stop the start up diagnostics. The draft detection switch is sometimes restricted or weak. Common problem. Tap the gas valve to see if the winter has caused the valve to seat heavily and stick.

Posted on Apr 25, 2010

  • 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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I own a Jandy LX400N-L heater, power is on but no display on LCD screen?


Is the Heater ON - button pressed? Or the toggle switch?
Or is that what you meant by 'Power is on'?
I thought you May have meant, breaker to Heater is on.
Anyway, check the heater on/off's.
If all is on, possibly bad panel or board.

May 13, 2015 | Jandy Pool & Spa

1 Answer

Jandy lx400n l


high limits are both on the side of the inlet/outlet water connections

Aug 25, 2013 | Pool & Spa

1 Answer

How do u remove hi limit switch from a Jandy LX 400N-L heater model#LX400N-L


high limits are located at header where pipes go in underneath
if those are ok check fusible link maybe 2 one at bottom one at top under top cover

Aug 15, 2013 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

How do i replace the ignitor in a Jandy lx400n-l, the manual does not show how to remove covers to get to the ignitor? thanks mike


shut off power remove the burn rack pull out ignitor wire goes under rack replace and put back together make sure no gas leak

Jul 13, 2011 | Jandy Lx Pool & Spa Heater - Electronic...

1 Answer

Fan for the heater will not come on showing service HI LIM SW on screen


That would mean the high limit switch. Check it and see if you can reset it. It may have gone bad. Check first and if needed find a replacement part. Good luck...Lee

Nov 25, 2009 | Jandy Lx Pool & Spa Heater - Electronic...

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