Question about Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas
I changed the filter cartridges, normal pressure, same problem.
Where is the pressure switch??
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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Posted on Jan 02, 2017
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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.
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