Have a GE Potscrubber 1430 - 7 years old. The timer knob will not move on its own when placed in the "start" position. Nudging it sometimes worked, but most of the time did not. I replaced the timer and it worked great for 4 or 5 days. It is now back to its old tricks. What else could cause this problem? I read that some dishwashers have an sensor that holds the timer until the water heats up to a certain temp. Not sure if this one has that feature, but I do know that the water seems plenty hot (based on the steam factor).
A service call and hundred bucks in parts is more than the cost of a new DW. I'd like to attempt this myself.