I have an old 120v spa. It had trouble previously, which I fixed by replacing GFCI outlet a couple of years ago.
It developed a new problem, which is t hat it does not heat water.
The pump, the timer etc, all work, but the water stays lukewarm (we have warm days). I set thermostat to the highest position, but it does not help. I am a reasonably electrically handy person (plz do not suggest to "hire a pro", at least yet), but I would like to know what typically goes wrong.
thanks
i