If you have an Asko Titanium Butterfly clothes dryer that won't turn on, I might be able to help. Press the power button. If the red LED above the power button lights, the unit has power. (Mine is pretty dim, even on the best days.) However, if the control panel doesn't also turn on, your dryer may have become overheated and automatically shut down. Open the door and let it cool.
So far, all of the above is in the user's manual that comes with the unit.
After the dryer has cooled down, press the overheat reset switch on the back of the unit. It's a black button in the middle of the back side. This well-hidden switch is not documented in the manual. (At least not the one that came with mine.) But, you can download a longer manual that describes it.
No amount of googling found this answer, it was only pure dumb luck that we discovered it and avoided an expensive and unnecessary service call. Hope it works for you, too.