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I replied to another thread by kingofthehill with details to get into the test mode.
https://www.ukwhitegoods.co.uk/forums/forum/public-support-forums/help-and-support/tumble-dryer-help-forum/878048-bosch-serie-8-wtw87560gb-02-not-drying-on-autoBy luck I found your post, although I might not be able to help much!
For the third time in the four years I’ve had this dryer, I’m about to open it up again. I honestly think that they are a flawed design that Bosch keep quiet about…
Our dryer – regardless that the filters are always cleaned and the seals are good – gets fluff build up between the cold and hot heat exchangers. This is an area that does *not* get cleaned by this so called self cleaning function which only washes the front of the cold exchange (see my picture, the purple is the “wash” drop pipe and where it connects on the exchanger). Blue is the cold exchange and red is the heat side. Yellow/orange is where you will see the fluff layer in my photos.
[IMG2=JSON]{“data-align”:”none”,”data-size”:”full”,”height”:”615″,”width”:”400″,”src”:”https://i.postimg.cc/W3Vb7cdG/Screenshot-20220406-235804-Chrome.jpg”}[/IMG2]
[IMG2=JSON]{“data-align”:”none”,”data-size”:”full”,”height”:”281″,”width”:”500″,”src”:”https://i.postimg.cc/0jWkx6cn/20200725-152939-exported-3371.jpg”}[/IMG2]
[IMG2=JSON]{“data-align”:”none”,”data-size”:”full”,”height”:”281″,”width”:”500″,”src”:”https://i.postimg.cc/V6FsGZt3/20200725-152939-exported-4338.jpg”}[/IMG2]
[IMG2=JSON]{“data-align”:”none”,”data-size”:”full”,”height”:”281″,”width”:”500″,”src”:”https://i.postimg.cc/rsFVvGCz/20200725-152939-exported-9604.jpg”}[/IMG2]
I have to take quite a lot of it apart to get the cover off the exchanger including taking the drum out.It’s very noticeable when this is starting to happen. Drying times take hours, the drum gets hot and humid, you may see condensation on the window even and fluff will build up at the bottom of the door in cycle (even with a clean filter). The air is being effectively blocked from freely flowing through the unit and everything just heats up. Even any water under the exchanger that hasn’t drained yet gets warm, creates more humidity and compounds the problem.
Upon cleaning our drying is much, much faster. Automatic programs begin to dry the washing properly again, otherwise they either take forever… or finish wet.
One of the things that we suffer from is we have dogs and the bosch filter actually let’s bits of our dog hair go through it. Like little wires I’ll find them poking through the “plastic paper feeling” initial filter, so some clearly go all the way. Over time they are going through to the hot side and then things start building up – again you can see in the photo – it’s like a layer of dust with a bit of dog hair meshing it together.
If it were “washed” by the self cleaning function this wouldn’t be a problem. I notice bosch have changed the design and new “autoclean” dryers now have another filter in front of the exchanger:
[IMG2=JSON]{“data-align”:”none”,”data-size”:”full”,”height”:”318″,”width”:”300″,”src”:”https://i.postimg.cc/fR6bJ9Zg/Screenshot-20220407-004226-Chrome.jpg”}[/IMG2]
[IMG2=JSON]{“data-align”:”none”,”data-size”:”full”,”height”:”173″,”width”:”300″,”src”:”https://i.postimg.cc/zfKGWGGD/Screenshot-20220407-004246-Chrome.jpg”}[/IMG2]
[IMG2=JSON]{“data-align”:”none”,”data-size”:”full”,”height”:”133″,”width”:”300″,”src”:”https://i.postimg.cc/vZ1BYzRV/Screenshot-20220407-004359-Chrome.jpg”}[/IMG2]I suspect if I buy that mesh and put it before the exchanger it might help me, I may try it.
The whole filter unit might even retrofit into ours because I’ve seen they do let you cut a maintenance entry there and s bosch sell a plastic maintenance flap that looks a similar size (without the vee shape and filter obviously).
Last thing. There is a test mode that shows compressor temp etc.
To get the dryer into it, turn it on and as soon as the display comes on, turn the dial from Cotton to Allergy+ and immediately then press the Drying Target button and while holding that turn the dial one more time clockwise. You’ll see the screen then will say p01. You can find online the bosch test mode descriptions that are mostly relevant and equate to each thing.Good luck. I’m never buying a self cleaning dryer again!
