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Calspa Heat Erratically Turns Off


RobertGary1
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I have an early 90's 220v large ps-3 supra electric. If we're in it for more than an hour or so with jets on high the heat will shut off and the spa will cool down. If I just leave the next evening it's back to 104F from the filtration cycle and it's running hot again. The heat breaker is not tripped.

I can generally tell what temp the spa thinks it's at by spinning the temp control and listening for when it clicks indicating its below the current temp. When this problem happens it acts as though it thinks it's at proper temp.

This year I replaces the timer (timer motor stopped) and last year I replaced the heater element. Otherwise everything works great 99% of the time. The heat otherwise runs nice and hot now.

I'm wondering if the thermostat could be dying and perhaps it's not as sensitive.

-Robert

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