Re: indesit
They can be a nightmare in all honesty, obviously you need to set the dial on a black dot then press and hold start for about 5 secs to let it clear. Very often though the earlier beasts play spaghetti hoops with the dial ’til you go giddy, disconnecting and reconnecting the slave timer sometimes works? Don’t count on it though as the pre-existing fault may have to be sorted first (i.e New Motor, Element etc etc)
If all else fails, tell your customer to right a note to Santa and walk away from it going Ho! Ho! Ho! 😆