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

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Jandy Pool heater not working

I'm getting an error message: Ext sw 1 So what is wrong?

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  • Jandy Master
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Pressure switch

Posted on Apr 29, 2016

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

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

  • 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

john224
  • 1378 Answers

SOURCE: My Jandy Pol heater is giving me an error message

Thank you for posting your question here on Fixya.com.

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.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!

John

Posted on Jun 13, 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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Jandy LXi gas heater error message "ignition control failed


if ignitor is glowing try changing position of the shutter 1/2 to 3/4 open should lite

Dec 22, 2012 | Jandy Laars LX Pool Heater / 250,000 BTU /...

1 Answer

My Lars LX400N-L has a serice satating EXT SW/1 fuisable link is open?? What can i do to fix that before people come over today?


Since it is likely dark already, if you haven't fixed it yet you will need to fix it before the next party. There are two issues, finding a new fusable link and figuring out why your fusable link opened. If I am correct, the fusable link opens when heat from the heater goes past it instead of out the exhaust vent. For this reason, if you only replace the fusable link it will also open when heating unless whatever causes it to open is not repaired also.

I hope this helps.

Sep 05, 2011 | Jandy Laars LX Pool Heater / 400,000 BTU /...

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