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

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Low pressure blinking on Laars LX heater - Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas

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  • jeff ross May 11, 2010

    check filter pressure gauge ,higher than normal can cause lower flow to heater. pressure switch in heater will not open to allow call for heat

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  • Jandy Master
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Check pressure switch

Posted on Apr 29, 2016

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SOURCE: my laars lx pool heater is blinking LOW PRESSURE.

The heater needs good water flow or it will overheat. You probally have a full basket in your pump or your filter is dirty.

Posted on Jan 21, 2010

  • 760 Answers

SOURCE: My Jandy Laars LX 400,000 BTU heater flashes "low pressure"

Once you try to ignite three times in succession, and the heater doesn't sense the presence of flame, the heater goes into "lockout" mode and must be reset to fire. This can be done by pressing and releasing the mode button so that the heater is turned off then returned to the desired mode. So if you were going to "jumper" the pressure switch, (connecting two wires together) make sure you do the reset also. Make sure you don't operate like this, if your pump quit, you could have a melt down. Also If you have anything connected to the fireman switch, it is in series with the pressure switch,and woud display the same thing. There is a terminal with two white wires, if there is a jumper there, then nothing conected, but if there is something connected, make sure it is closed. Also be sure your code was for Water pressure and not air pressure switch. You can download manuals at: www.jandy.com

Posted on Jul 27, 2010

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1 Answer

My laars lx 250,000btu just displayed a "low


Check your baskets for plugs or your filter may be dirty. The impeller may be clogged in your pump if your pump basket is set wrong or if it has any cracks in it. These will all drop the pressure to the heater.

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Message 'LOW PRESSURE' on my Jandy LX pool heater. How do I check the fuse?


Check your flow and pressure from the pump first.... May need backwash, skimmer/strainer cleaning.. If you get an error message, chances are the fuses are ok.

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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.

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1 Answer

My laars lx pool heater is blinking LOW PRESSURE. How do I fix?


The heater needs good water flow or it will overheat. You probally have a full basket in your pump or your filter is dirty.

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1 Answer

Pressure switch lite blinks


inside the heater , but hold downd what is the pressure for the filter. that is the anwser low impeller plug or worse line plug high after the filter something is not let the water back to the pool

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