Just had a phone call from my daughter who has one of the these.
Some time back I had to call and found the front fan totally choked. She now knows how to clean this but has just phoned me to say it is flashing up F2 again.
She is finding the front fan clogged and yet says there is hardly any fluff collecting in the door mounted fluff filter???
Missed this Jim, sorry, but the usual cause of this is a slipped off door seal under the filter. You need to look closely to notice it but the seal pops out of where it should be and needs re fitting back in. had a few over the years. I cannot picture it at the moment to give you more details but I am sure you can work it out.