Here are some helpful guidelines.
But remember every model of Freeview|HD® digital set-top box or television with Freeview|HD® built in will be a little bit different so it’s best to either refer to a specific retuning guide or to your operating manual.
If the retuning process does not restore all television channels, you may need to contact your equipment manufacturer or a local service company for assistance.
Please see the following websites for operating manuals for the majority of Freeview|HD® equipment:
Shared Aerial: If you share an aerial installation with others, such as in an apartment or retirement village, you may need to contact the management of the complex for advice on whether the installation requires any modification.
View through Computer: If you view digital TV through a computer using a digital television tuner, you will need to retune through the programme settings.