I have a Pentair Mastertemp 250 heater that's having some problems:
-temperature control only allows increasing the temp, can't decrease it
-cannot turn off manually with "Heater Off" button (you can hear a click, the lights turn off, then it immediately turns back on)
-can't switch from Spa On to Pool On (immediately switches back to Spa On right after pressing Pool On)
I ordered a new control panel board and it fixed the temperature control issue, but added the Spa On problem. After looking at the owners manual, I didn't find much in the troubleshooting section that related to these problems. I've had to turn off the gas and circuit breaker for it to turn it off.
Any ideas on what I should check next?