Hotpoint Aquarius Combined Washer/Tumble Dryer

From the on line hand book
Dryer doesn't dry........The appliance is not plugged into the socket, or not enough to make contact.
• There has been a power failure.
• The appliance door is not shut properly.
• A DELAY TIMER has been set.
• DRYING is in the * position.

Ooh that's weird I've never heard of a tumble dryer with no filter as you say what happens to the fluff. I empty the filter every time I use it and can only imagine how much fluff there'd be after a year.