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

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Pressure switch lite blinks

I changed the filter cartridges, normal pressure, same problem.

Where is the pressure switch??

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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

Posted on Sep 13, 2009

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1 Answer

Will only heat on high mode hot tub


Sounds like low speed isn't providing enough water flow to close the pressure switch that allows heater to run. Its unlikely anything has changed in the pump other than a possible obstruction so to troubleshoot by most common failures first, try removing filter cartridges. If it heats on low speed with no cartridges installed then you need new filter cartridges (even if they look ok). If not the pressure switch might need adjusted or replaced. Most pressure switches can be bypassed with a jumper wire to diagnose but should never be left bypassed for normal operation.

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Spa indicator says Water SW Open...what does that mean and how do I fix?


This means that the pressure switch is not closing. Generally, this is a lack of water flow issue. The main cause is a dirty filter. Clean cartridges, backwash sand, backwash and recharge DE, whatever is needed to clean the filter, this should fix the problem. If not check other sources of restricted flow: filter baskets, pump baskets, shut-off valves. If everything is clear and there is good flow returning to the pool it could be a bad pressure switch. Replace with the correct switch for your heater.

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1 Answer

The pool filter won't turn on and the pressure switch on the heater is blinking


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


There is not enough system pressure to close the heaters pressure switch so the heater will not fire or it may be the switch itself is bad but you should first check for system problems that will cause this light to come on.

Assuming your pump is on and any valves in your pipes are set correctly it means something is restricting water flow too much and needs to be cleaned to fix your flow rate and allow the heater to fire.

Start at the skimmer(s) baskets and then the pump strainer basket and finally clean your filter. If it is a sand filter backwash the thoroughly; if it's a cartridge or DE filter, clean it according to your manufacturer's direction. In some cases cleaning a cartridge filter will no longer satisfy heater pressure requirements meaning you will need to replace the element.


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

Dec 31, 2010 | Jandy Laars Lt 250,000 Btu Heater

1 Answer

My pool heater turns on, runs a few minutes, the igniter lights and the heater heats for about 3 minutes, then turns off. I see a SERVICE comment blinking and SW2 is also blinking.


im not sure what filter you have on there but do a good cleaning if its D.E acid wash it if sand clean the sand. your not keeping enuff pressure to keep it lite. take it slo

Oct 15, 2010 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Pressure SW LED lite and ERR error code with service LED lite.


either you have a problem with the pressure switch or your filter is very dirty or your impeller is clogged. make sure the flow is good, then check the pressure switch.

Aug 24, 2010 | Pentair Minimax NT Heater

1 Answer

Oil lite came on right after oil pan gasket


Hi. This issue has several causes, but the oil light indicator is a strong sign of low pressure in the engine. This will cause the engine lubrication rate to drop, thus, producing a illuminated oil light, and erratic Oil pressure readings. The necessary actions are to have a manual oil pressure test ran on this engine, asap. When running a manual oil pressure test, you will discover if the true oil pressure is low, or normal. If the test proves that the oil pressure is, indeed, low, this will confirm that the Oil pump is suspect.

Now, if the true readings given during the manual oil pressure test are indicating that the pressure is normal, this will be the result of a failed sending unit(oil pressure switch).

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no with the red lite on it mean that you need to change your filter its a safety feature so you dont burn out your motor and also so you dont blow unpurified air through out your home

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Laars lite 2 LG or LD Pool Heater- Heater won't stay on


the control module is the problem it allows the heater to come on then turns off power to the gas valve.if you are not getting enough water flow the high limit is turning the heater off then your problem is flow.

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