I’d check the signal strength first through the settings on the humax and if that doesn’t show anything then via an in-line strength checker – ebay, couple of quid.
If you’re not getting signal, then it suggests a cable or dish issue – could the recent winds have moved the dish, or dis-lodged something which may have dropped on the dish, or a cable come off the dish. Many things it could be beyond the Humax.
EDIT – the dish alignment needs to be spot on, any small movements and it’ll be off. if the signal strength things are shown no signal then it could be worth having a quick play with dish alignment, as it could look unchanged, but in reality is looking at nothing.