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

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Jandy LX Pool Heater Pressure Switch Light Flashing Red

Should I replace it Tried adjusting it but it has come on again Assume adjusiting it to a lower setting could result in the heater firing up without water flowing thru it Suggestions Is there a better brand of switch

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  • Jandy Master
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Set back to where it was take off copper line unplug it should work

Posted on May 28, 2015

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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: how do you replace an air flow switch in a Jandy

order the flow switch open the door take off hoses take screws off reverse with new air swtch just dont send the old one

Posted on Aug 19, 2009

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1 Answer

Pressure switch light going off and heater won't start


back wash filter. clean out pump basket, ensure you have proper water flow. Once you have ensure proper water flow and problem still exists, you will most likely have to replace the pressure switch

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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.

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Pressure switch fault on jandy xl POOL HEATER


check to see if pressure switch has voltage both sides also check copper tube to see if plugged

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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.

Jun 16, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Low pressure flashes when i try to turn on the heater


check strainer and skimmer for excess debris that will cause low flow to heater thus not engaging pressure switch.make sure filter is clean.if all of these check out ,take continuity reading on pressure switch.if no continuity,try to adjust pressure switch if it wont adjust ,its faulty.take extreme caution when adjusting make htr will shut down when pump goes off

Jun 23, 2009 | Jandy Lx Pool & Spa Heater - Electronic...

1 Answer

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?!?

May 10, 2009 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Pool and spa heater will not turn on, low pressure on display


1) check the fuse on the transformer. You will get "low pressure" if the fuse is blown.
1a) remove front panel with flat head screw driver turning both big screws 1/4 turn clockwise
1b) look up under the 1 remaining front piece for 2 screws (one on each side). remove them and the 1 small panel slides down
1c) transform is directly in the center of this compartment
1d) red wire on transform has a black fuse case - twist open and check fuse (with an ohm meter it should read a dead short if it is working).
1e) if not working - replace with standard 250v 2a bus fuse.
2) it really is low pressure
2a) backwash pool or at least make sure pressure in filter take is not too high (high filter tank pressure == low water pressure in heater)
2b) if you have a bypass valve make sure it is not in bypass mode so most all pressure from the pump is going tothe heater
2c) right next to the transformer is the pressure switch. It has a small copper tube attached to the back and 2 wires in the front. Put an ohm meter across the two leads on this device. With the filter off it should be open, with the filter on it should be closed (short). If not either the copper tubing is clogged, the switch is faulty, or there is not enough water going through the heater. The amount of water that goes into the heater is adjustable and the water pressure switch is also adjustable. The owners manual explains how to adjust both but neither should need adjustment unless you have a special configuration (explained in the manual).

Apr 02, 2009 | Jandy Lx Pool & Spa Heater - Electronic...

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