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

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Pool heater says low pressure - Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas

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If filters are clean check pressure switch if 24 volts on both sides ok if not check copper tube for blockage you can jump just to check

Posted on Mar 05, 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

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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

  • 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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