Are all of the functions from the rotary switch attached to the timer? I’ve had incidents where a loose wire or damaged circuit board will make the timer think the rotary switch is in the stop position.
For example, customer switches knob to Tire Cleaner and the function works but the signal isngetting to the timer. The display doesn’t scroll “Tire Cleaner” and it isn’t announced over the speaker.
If the timer doesn’t get a signal from the rotary switch it thinks the rotary switch is on “Stop”. There is no wire from the switch to the timer for Stop.
it is difficult to explain. Let me know if you need more clarification