I have an Aqualink RS with a Laars LX400 heater ~ 7 years old. Spa temp set for 104. Turned the sysem on and it heated to 94 and stayed there. Temp sensor seemed to work correctly., to test I disconnected the water temp sensor so it measured air temp, which it did acccurately. I expected the heater to just keep running but it got to 98 and cycled there and wouldn't go higher.
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