Are the clothes all hot and steamy at the end of the drying cycle ?
There are a couple of reasons for the hot air/steam/condensation being forced out of the soap drawer although it seems you’ve checked them.
Does the condensor valve work through the whole cycle ? I have had a few that will work for 5 -6 mins then go open circuit , stopping the flow in.
When you said no blockages , have you checked the condensor box thoroughly ? It normally clogs up where the unit connects to the drum….pig to remove and even worse re-fitting but if its blocked with fluff there’s not really any other way. Sometimes a flush through with a mains water hose will clear it but i’ve never found it that successful. Hardest part on refitting is making surethe bottom connection is on fully around the back as you can’t see it without a mirror.
There is also a modified container/hose that replaces the original one. Its the small opaque container bwteen the valve and main condensor – new part is 613722 . The small hose between thiscontainer and the condensor has been re-modelled to a differnt shape to also stop steam escapinf from the detergent drawer . #
Hope this helps