"NT" wrote in message
...


My money's on the controller.

The water temperature appears to be correct for the heat setting. I took the
controller board out and noticed overheating on it, marked by lines of soot
along the conductor print. It looks as though the coil device on the other
side is the cause of the heat. I suppose I'll just have to take the gamble
on the price of a replacement board. I can't think what else it could be.