i am having the exact same problem with Watkins heater relay board. replaced just six weeks ago.
dont want to purchase another until i know why they are failing or if i breakdown and pay for spa place
to do it then we must have some warranty on the board. fifteen years of self repair been fortunate
usually circ pump or thermal switches. definately a problem with this re-designed board. can we still
purchase the original ? our hot tub is an 05 PRODIGY WATKINS MFG GOOD LUCK TO ALL