CANDY Reverse Action Condencer Dryer NOT CONDENCING?

I have a Candy condencer tumble dryer, the only markings on this is as above title.
The machine has suddenly ceased to condence the removable drain tank remains empty although the clothes come out quite dry

How does this machine condence the hot air the cooling radiator appers to be empty is this a pumped system or is it static

I am not a washing machine mechanic but have a good grounding in mechanical basics

Many Thanks