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Hi All, reporting back. I got the "piece of junk" and installed it today and lo and behold, it works great. Seems to be better than the piece of junk that was the PentAir OEM control board. For now anyway! Thanks to all that responded and helped.... very cool of you to spend a little...

Hi All, thanks for responding to my thread. It took me a few weeks but I finally got back to this. ajw -- I put a 10K ohm resistor across the thermistor wires -- panel reads 98 degrees when I do that. So the problem is clearly in the control board (or the wires). I visual'd the wires...

I can't get my spa to heat up above "lukewarm" -- maybe 88 degrees. I have a Pentair MasterTemp 250 heater, ~4 years old, worked fine for years. Now, it reads ~15 degrees hotter on the inflow water temp than the water actually is. For example, when I turn it on, and the spa water temp is...