Replace water sensor that goes from board to header
SOURCE: Panel reads "water sensor opened"
I had the same problem. The water sensor is on a pipe running into your pump. It will have a circular clamp around it. Remove the clamp and pull the sensor out of the pipe. The wires should run into your control box. disconnect the wires and replace. My water sensor was part 7790. Not sure if you have the same one. Do an online search. bestbuypoolsupply.com has them for $50 plus 9 for shippng. Hope this helps.
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?!?
SOURCE: Jandy pool heater model #LT400N-L service and ES1 light blinking
The heater won't fire up if there is no or inadequate water flow. Ck water pump and filters.
SOURCE: FL 4 error, Jandy Lite 2 pool heater
I believe you may have a draft restriction and this may stop the start up diagnostics. The draft detection switch is sometimes restricted or weak. Common problem. Tap the gas valve to see if the winter has caused the valve to seat heavily and stick.
SOURCE: On My Jandy Aqualink display I am getting a read
it either means your water sensor is bad its the little probe thats clamps ontop of pvc with the probe inside of it, or it simply could have been unpluged somehow from the back of the outside control board it will be on the far left side its a a two wire red and black on the green strip plug
Testimonial: "Fairly quick response and accurate. Thanks"
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