I had the same problem. My 1 year old Bosch Maxx 7 sensitive condenser dryer would stop after a minute or so and would indicate a full tank of water. Filter was clean, water tank empty, cooler filter think from the front bottom left of dryer was clean, made me crazy!
Found this great post, took apart my dryer, hoses clean, no problem... Then I found a "secret door" flap, whatever, located in the bottom panel in the slot where the large cooler/filter thing goes. It is in the way back on the bottom. Lies flat has two hinges that you pull in with your fingernails towards you. Lift the flap up and you have a small holding area that gets full of gelatinized sludge! Pulled out about a cup full of lint filled slime gel, dried everything, put cover back on, viola! Works like new.
You don't even have to take the dryer apart if you can find the secret flap! Oh well, at least I know how to take it apart if I ever get bored. Thanks a million for the posts you great, helpful people!