Question edited for clarity.
It sounds like it needs a new board, the clicking is a relay. Doing a Power Reset is the normal first course of action, but when you unplug for a length of time, you have done it.
There are some ideas here but just talks about resetting or setting the clock.
https://www.google.com/search?q=Smeg+oven+clock+ticking+and+blinking
..
×