I have an old spa.
At some point recently it stopped heating water. It still circulates, though.
I have traced the problem to a faulty thermostat switch (with a knob to set desired temperature).
The proof of this is that if I electrically connect two terminals of the switch, then the heater relay closes. That is not happening if the thermostat is set even to its highest setting.
Here's the weird part. Three years ago I had the same problem -- when I moved into this house, the spa was not working. So I went to a local dealer and bought a new thermostat and installed it. It lasted about that long, and now it i s bad again. WTF? Any idea just what might be possibly wrong, or are these thermostat switches really that bad?
thanks
i