Thread Number: 94778  /  Tag: Modern Dryers
How can I clean the water tank of my Bosch AutoClean Home Professional tumble dryer?Why is it dirty?
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Post# 1194101   11/23/2023 at 03:42 by wholelottared (Turkey)        

Hello everyone!!

I bought a flagship Bosch dryer last year, an AutoClean one that washes both the evaporator and the condenser. It's Home Professional, WTX87EH0TR (these info aren't needed for this problem I know, but sharing for the curious ones).

As y'all know, AutoClean devices doesn't have the usual door filter, so I bought them and added them myself the first day I bought it, so my device can last even longer. So now my device has the 2 way door filter that every Bosch dryer has + 2 AutoClean filters at the bottom. This makes the device protected from fluff in the best way, plus it washes both the condenser and the evaporator. The fins at the bottom still looks as clean as the first day I bought it.

But I have a problem. Everytime I empty the water tank, I realized it got dirty day by day with the fluff build up. The filter of the tank is not damaged, I checked. Even with 2 filters in bottom area + 2 additional filters I bought (4 filters in total) somehow fluff was able to reach the water tank, even though the evaporator and the condenser looks clean.

How did this happen? I don't know if it's connected, but is it because I use softener on the washing machine?

And most importantly, how can I clean this? Because it goes all the way inside, it's not only at the beginning.

I'll share some photos I just took, so you guys can have an idea of what I'm talking about. I'll be waiting for the replies, and the discussion about why is it happening and how can I clean it.

Thank you so much.


  Photos...       <              >      Photo 1 of 3         View Full Size



Post# 1194102 , Reply# 1   11/23/2023 at 03:48 by ozzie908 (Lincoln UK)        
Have a similar issue

ozzie908's profile picture
All I do is bleach it with warm water let it sit for a while and rinse with clean water.

`its the fine particles that none of the filters catch thats the problem.


Post# 1194104 , Reply# 2   11/23/2023 at 05:57 by wholelottared (Turkey)        
replying to ozzie908

So did warm water with bleach help you with this problem?

I tried cleaning it with almost boiling water before, but it didn't help, the bottom was still black with fluff. But I didn't try adding bleach though. Does bleach break the fluff pieces or something? I'll try again with bleach if it really helps, thank you.


Post# 1194107 , Reply# 3   11/23/2023 at 06:32 by ozzie908 (Lincoln UK)        
Wholelottared

ozzie908's profile picture
It comes back after a while but bleach certainly helps.

Post# 1194114 , Reply# 4   11/23/2023 at 09:00 by henene4 (Heidenheim a.d. Brenz (Germany))        

These dryers do use the water in the tank to do most of the flushing.

Some fluff will always remain in that water, and it will settle in the tank no matter what.
It's not like anything is clogged, and if the condenser is clean, everything is working as intended.


Post# 1194129 , Reply# 5   11/23/2023 at 15:21 by Logixx (Germany)        

logixx's profile picture
Interesting. This is the water tank of my selfCleaning after three years. I remove the blue filter before emptying and, since the dryer is in the bathroom, I tip the whole thing over and water gushes into the bathtub. Maybe that extra water turbulence helps to keep the tank so clean.

I have, maybe four times over the years, removed my shower head and stuck the hose into the water tank to flush it out at full force - but there's never been really anything in there as far as lint goes.


  View Full Size
Post# 1194169 , Reply# 6   11/24/2023 at 02:25 by wholelottared (Turkey)        
replying to Logixx

that's really interesting. why does mine has fluff and yours doesn't even though my device has more filters?

do you not use softener? or is it because my device washes the back condenser too?


Post# 1194173 , Reply# 7   11/24/2023 at 08:53 by Logixx (Germany)        

logixx's profile picture
I use softener with practically every load - about 30 ml.

I've seen a YouTube video if an appliance retailer, who also has a AutoClean dryer and his water tank also had stuff in there. I will say that I'm very thorough about the filters, vacuuming them as well as both seals after almost every cycle. When drying small loads of shirts (almost no water left after spinning) I'll sometimes fill the tank prior to drying so the flushing cycles can do something (although the shirts don't give off lint).

I haven't used this blue cleaning fluid Bosch sell. I don't know what the inside if the heat exchanger looks like, but the fins at the front are spotless.


Post# 1194225 , Reply# 8   11/27/2023 at 15:38 by wholelottared (Turkey)        
replying to logixx

Maybe AutoClean ones has a different kind of pump that is able to pump more fluff at the bottom of the device to the top? or maybe SelfCleaning Condenser devices has a filter in the pump that blocks fluff to go to the tank, but AutoClean ones doesn't have a pump filter. Just my guess though, it's definitely interesting.

Post# 1194299 , Reply# 9   11/28/2023 at 14:22 by Logixx (Germany)        

logixx's profile picture
According to Bosch's spare parts website, the exact same pumps are used.

Post# 1194300 , Reply# 10   11/28/2023 at 14:27 by henene4 (Heidenheim a.d. Brenz (Germany))        

The more lint the water has to wash away, the more will become suspended in it.

On the AutoClean system, the water has to flush away all the lint every load produces.
On the SelfClean system, it's only the bit that gets past the 2 filters.

By nature, some parts of the lint will be so small they are basically "dissolved" in the water.
No filter will keep that back.



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