Very similar model to my brother`s long suffering machine. Yep that`ll be a condenser blockage problem which is the achillies heel of washer dryers (well, that is one of them!). The condenser chamber is that semi transparent plastic fantastic affair moulding underneath the aluminium heater/fan manifold (which needs to be removed too) that runs around to the rear of the tank and is not consumer friendly to remove and clean out and if you refit it badly you get a leak / flood with the pcboard very close by so any cock-ups can be a nuked machine. If your are unsure what the devil I`m on about Google this part number C00255440 (based on your info – there maybe several designs based on the serial codes – but which should at least produce a picture. Anyway, under normal circumstances you never need to buy a replacement you just simply wash them out. If you get that far ( and I really would advise, as per does Dave, that a technician sorts you out thus saving a watery disaster) do not forget to clean the moulding`s dryer metal disc lint filter (C00143949) that gets its tiny holes blocked up too of course.