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

1 Answer

Low pressure reading on Pool Heater

I have a Jandy LX pool heater, and Im getting a low pressure reading which is prevent the heater from starting. Water flow is fine and fiter is clean. Do I need to replace the pressure switch?

Posted by onederluv500 on

  • tdow279 May 16, 2009

    I have the exact same problem.  Just opened the pool and heater won't start due to low pressure flashing on screen.  Does anyone know what is causing this and how to fix it?



1 Answer


  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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


Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Low pressure indicator flashing and current temp reading missing. Any ideas?

low pressure can mean from either water supply or gas. make sure the pressure switch is closing at 2psi.

Aug 03, 2013 | Jandy Laars LX Pool Heater / 400,000 BTU /...

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.

Jan 20, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

My Jandy Heater contol reads.. Fault check ignition control> what should i do?

Check all the gas jets on your heater unit. Spiders love to buld little webs in these things and it might prevent gas from reaching the ignitor.

Oct 08, 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 /...

Not finding what you are looking for?
Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas Logo

1,332 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jandy Pool & Spa Experts

David Spradling
David Spradling

Level 3 Expert

11590 Answers

Bill Jordan

Level 2 Expert

375 Answers


Level 1 Expert

62 Answers

Are you a Jandy Pool and Spa Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides