Jack55 Posted March 10, 2021 Report Share Posted March 10, 2021 Before the freeze in Texas a few weeks ago, I "winterized" my pool equipment by removing the filter, pump, and heater "plugs" and drained the system. After the freeze, I replaced the plugs, primed the pump and started up the system. Everything works, except the Jandy JXi gas fired heater took 4 hours to heat the spa section of the pool from 68 degrees to 104. The heater never cycled on and off; it ran continuously until the temp was reached, and then it shut off. Before the freeze, the spa heated to 104 in 30-40 min. What could the issue be, and how do I fix it? Show less REPLY Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted March 11, 2021 Report Share Posted March 11, 2021 @jimmythegreek, any ideas? Quote Link to comment Share on other sites More sharing options...
jimmythegreek Posted March 14, 2021 Report Share Posted March 14, 2021 Double check that you valves are activating properly. This issue usually is a result of either the powered valves or a manual valve not keeping the spa isolated. If that is 100% not the issue then likely a gas issue whether pressure or low flame output 1 Quote Link to comment Share on other sites More sharing options...
basamATX Posted January 18, 2022 Report Share Posted January 18, 2022 Did you ever figure out the issue? Mine is doing the same thing. I replaced the Jandy Thermal Regulator Valve and Bypass Valve, as that is what the manual indicated might be the issue. The heater kicks in, stays on, but water is lukewarm. Quote Link to comment Share on other sites More sharing options...
Lpool Posted April 24 Report Share Posted April 24 did you solve your issue? I would like to know how too! Quote Link to comment Share on other sites More sharing options...
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