A: To set the time, just press the button to release it and hold the relevant knobs, the time will display on the timer in that case.
A: Indeed, both the ovens can be used at the same time, you just need to set different profiles to each oven.
A: For starters, make sure that all switches have been functioning normally and also check that the fuse within the fuse box is not broken.
A: Do not use stainless steel lids as they are heat reflective but use ovenproof ones instead. Choose dishes that are not too big for the joint that is being cooked.