Works only after renovations.

The time switch has constantly reset. Due to low price I have not complained about the clock, but open.
With a suitable screwdriver, I could open the security screws. Now the problem was clearly recognized, the relay and the electronics were well separated, but a cable for the power section was just passing next to the cable for the display. Without further ado, the cable laid on the other side (without tools), far enough from the electronics part. Since that time (several months ago), I had no more problems. For all the professional that is not a problem, all other I advise, refer to the safety. Now raised by me on 3 stars because it works perfectly now.