How can I force a retune of my DVBT-tuner. Last Sunday I wanted to watch Ch4 Formula1 and the system told me that just Ch4 was unavailable. I tried a few buttons but could not find and remember whether there was such a function.

menu. auto tuning. 

 

puts on a new setup.

 

could be transmitter fault though

 

https://ukfree.tv/maps/freeview

 

 

For some reason channel 4 is back in the car.

But I cannot find the menu. auto tuning you mentioned.