Hi all. I have a Raypak propane heater on my attached spa. I don't know the exact age of the heater as we bought the house this summer. I suspect it is 4+ years old, but only guessing. This issue I have is when I heat up the spa, it comes up to temperature nicely, but once it reaches the desired max temperature of 104, it does not hold this temperature. Instead, the spa cools by up to 4 degrees before the heat will kick back on. The water temperature reading shows the spa cooling down to 101 or 100, but the temperature on the heater itself still shows it at 104, so it does not heat the water. Any thoughts on what might be causing this and/or how I could correct it? The pump is running at a high speed and water is circulating through the heater, but it is as though the water at whatever sensor the heater itself uses is not getting the recirculated spa water. Your ideas and input are appreciated!
-Chad
-Chad