It's a good chance your timer is stripped. the problem is the knob has to come off first, to get the timer off. remove the 2 screws on panel, lift the panel up and back on it's hinges. check to see if your timer is plastic or metal. If plastic, pull up the little black plastic keeper and then pull off knob.
If it has a metal timer, you are gonna have to carefully saw or cut off the knob! |