We have a 2 1/2 year old SR400NA we use to heat our SPA. Last night the SPA would only heat to 94 degrees as reported by out Pentair Water Easy Touch controller. The water was lukewarm at best. I tried shutting off the breakers to all the pool equipment to see if that woul reset everything, but that did not help. I then went to the heater and looked at the display which was reporting the water temperature at 104 degrees (high-temp lockout). The service light is NOT lit, so it thinks everything is good. Is there an easy fix for this or am I looking at replacing the thermometer in the heater.
I went out and tried to heat the SPA again today and the SPA will only come up to 77 degrees while the number on the heater's display says 104 (I'm assuming that is the temperature the heater thinks the water is at).