brand new Bosch Home Professional tumble dryer made weird knocking noises. What was the problem ?

Automatic Washer - The world's coolest Washing Machines, Dryers and Dishwashers

Help Support :

The condenser is not removable, so hard to tell. It looks clean as far as I can see. Under the condenser is a thin layer of blue lint, a bit sticky/wet. It is easy to remove. Usually it was clean under there too. I will keep an eye on it.

The Auto Clean system looks more desirable, but that wasn't available yet when I bought my set (2018).
 
Reply to #29

@moon1234 , to be honest, I saw the videos of ticking Miele's and they were sounding even louder than my faulty device.
Here are some example videos, check the comments too:

Video 1:

Video 2:

Video 3:

Video 4:

 
Miele dryers

I have the TOL M Touch TCR780, which was a warranty replacement for a TCR860 which had a warped drum. It still makes the ticking noises, although I was assured it wouldn’t as it supposedly has a “Silent” drum (in reality it’s no different to the TCR860 I had before or the one my mum has). I’ve had to learn to live with it as an irritation - although one could argue it’s not something you should expect from a “silent” dryer that retails at the price that it does. It only seems to be a phenomenon with the later models - older Miele dryers (including earlier T1s) will still tick but only faintly and not as audible throughout the house like the newer ones.

The TCR780 is however an improvement from the previous TCR860 in terms of control of the drying temperature. My TCR860 got to 65°+, even on Gentle tumble and would shrink laundry if you weren’t careful, which was never a problem with my previous T8860WP Edition 111 dryer (which had the separate fan and equal drum reversing, why I got rid of that I don’t know 😂). The TCR780 uses the cooling fan a lot more to dissipate and control the heat inside, so is a bit more forgiving. It also has the DryCare 40 cycle which limits the temperature to 40 degrees and basically runs the cooling fan for the whole cycle. I’ve noticed it’s gentler on jeans and elastic - although I have still had a couple of t shirts shrink when using that setting. I tend to use automatic plus for the majority of laundry and it dries evenly - although I do have all the drying levels adjusted to max in the settings menu.

One huge benefit of the Mieles is the filtration and the ease of maintenance - so simple to clean the foam filters on a cold 30 min cycle in the washing machine. When I worked in the industry we once did an experiment where a Miele with foam filter was compared against a self cleaning condenser, and after an extended period of so many uses (can’t remember the exact figure) the BSH condenser was heavily clogged with lint whilst the Miele was spotless from being protected by the additional foam filter.

The bed linen cycle isn’t bad and is certainly an improvement from the first generation of T1s which had a tendency to tangle lighter weight bedding on particular. The only glitch on the newer models with the HygieneDry level is that if you select extra dry on bed linen it will still do the Hygiene stage and over dry laundry, so the highest level you can use is Normal plus. Because of this it will still occasionally leave damp patches. I find whilst not tangling into a ball it will still crease/wrinkle bedding quite badly if you don’t dry the duvet cover separately from the bottom sheet (though again this will happen in any dryer). Because of this I tend to just dry bedding overnight on the clothes horse, which is more efficient still than using even a heat pump dryer.

In fact in the majority of circumstances I prefer to air dry laundry either on the horse overnight or on the line weather permitting. It’s better for the clothes, creasing if any just falls out and is also free, especially important with the price of energy nowadays :-). Although we are lucky that we don’t have allergies and have a fairly well ventilated house for laundry to dry quickly inside. I only really use the dryer for towels or if I have a lot of washing to get through at once, so one could argue I don’t really get the value out of the Miele 😂.

I personally always thought it was little silly how the majority of BSH dryers here even still don’t reverse, luckily the next generation of Series 8/iq700 ranges due out have the bed linen cycle. Another machine to watch are the Haier I-pro machines - granted you aren’t getting the German engineering but they reverse evenly and they have launched a new model which is only 59dB. They are fairly solid too as they are based on the F&P machines, and have a 5 year warranty which is more than the 2 you get nowadays from Miele and Bosch.

I haven’t owned one but I have used a friends AEG 9000 series dryer a few times and it’s certainly a nice machine, very quiet, doesn’t tangle or crease much at all and is the gentlest dryer in terms of heat that I’ve used, very similar to the Edition 111 Miele where clothes are barely warm to the touch. As others have said though it is a shame it doesn’t have as strong filtration, and my partner had reliability problems with an AEG Protex heat pump a few years back.

Before I forget - Miele dryer drums are 120l regardless of capacity. The washer drum volumes are 64l for the SoftSteam drums (all 9kg and older 8kg), and 59.5 for the traditional honeycomb drums (7 and most newer 8kg).

Jon

lavamat_jon-2022121116011205237_1.jpg
 
Some pictures of the filter system on the T1.

One feature I forgot to mention and that I use a lot too is steam smoothing - it’s great for shirts, just hang dry afterwards and has meant my iron has not been used now for years :-)

Jon

lavamat_jon-2022121116045606930_1.jpg

lavamat_jon-2022121116045606930_2.jpg

lavamat_jon-2022121116045606930_3.jpg

lavamat_jon-2022121116045606930_4.jpg

lavamat_jon-2022121116045606930_5.jpg
 
Reply to #31 and #32

Thank you for your detailed reply, Jon. @lavamat_jon . Since you talked about the Miele's filtering system, my Bosch has an AutoClean, not a SelfCleaning Condenser. AutoClean is the upgraded version of that where you can reach the condenser at the bottom, it has two filters there but it doesn't have any filters on the door. You clean the bottom filter every 6-10 runs and that's it. Because of this I bought the double filter for the door which older models already use, and tuened it into double door filter + condenser filter + autoclean, so it still cleans itself even though no lint even reaches inside haha. It probably reduces the airflow a bit since it doesn't have the door filter normally, but it didn't create any problems yet, and hopefully it won't. I think adding that additional filter really helps getting a longer lifetime from the dryer, this way I'll have to clean the door filter after every use (normally you need to clean it like every 6-10 uses with default AutoClean) but it doesn't matter for me and I prever lifetime over cleaning so I clean the additional door filter after every run.

English isn't my main language so I might be writing a bit complicated but hopefully i'm understood haha. Thank you.
 
Reply to #28

Yep quickly went back and this was what I measured with similar loads on Mix plus on the Beko (no low temp option on this dryer), Cotton Normal Gentle Tumble on the Miele and Mixed +2 Low heat on the Bosch. I’ve noticed though that the Beko is quite “stupid” per day since if you start a new programme even if the compressor is barely warm the cooling fan is turned on constantly until end, so a lot of heat is just emitted into the room and wasted so the next load will finish much cooler say around 45c, the Miele will not do this and simply turn the fan on when needed and will finish roughly the same time or a few C less. No idea what the Bosch does but I assume it’ll only get hotter🙃. I do find the overall performance of the Miele far superior, since it has higher airflow rates things like pockets/cuffs/waistbands/ hoods of hoodies or pockets and waistbands of joggers (which I dry all inside out) come out perfectly dry, whereas they’ll still be damp from the Beko since the airflow is much less, I think the Bosch is slightly in between. I do also have the Mieles dryness level set to Max for cotton cycles. Mine also made the exact same ticking noise, after arguing with Miele they did replace the whole brush piece but obvs it came straight back, it doesn’t bother me anymore since the performance makes up for it. Both Bosch and Miele are over a year old and their evaporator fins are still spotless, but I’ve had to flush the bekos through with water multiple times through it’s life to try and keep it clean (both mine and my partners families models are starting to smell of damp now from clogging of lint)

mrlaundry1011-2022121116145504749_1.jpg

mrlaundry1011-2022121116145504749_2.jpg

mrlaundry1011-2022121116145504749_3.jpg
 
Reply to #35

Thank you so much for your detailed answer and test, @mrlaundry1011 . I really can't believe Bosch makes that much of a difference, 70C° is toooo high for a heat pump. I can't believe they're selling this as a “gentle dryer on your clothes” slogan too. I wish I did this research before buying the dryer instead of after drying it. My only motivation right now is that i'm 100% sure mine uses the fan on Mix sometimes, so maybe mine is programmed better since it left the factory just some weeks ago lol. And it shows a newer software version compared to my friend's on the HomeConnect app. Hopefully that's helping.

About the Beko, I always found them trash. Their sensors are unreliable, they don't have a condenser filter and their door filter is also unreliable, and even though they reverse people say things still ball more than Bosch for some reason. There's a channel on YouTube called GodDay b and he keeps talking about how Beko's are superior at everything but I don't agree.

About the Miele's ticking, I would actually still buy Miele over Bosch even though the ticking because of it's superior performance, but my family also uses the dryer and they get so mad at noises like that the house, respectfully lol. And they're right too, because from what I see that sounds too loud even on YouTube videos, so I didn't went with Miele.
 
Adding to #36

I forgot to say, another weird and different thing I noticed on my Bosch is that for example on Mix (haven't checked this on other programs yet), after running for 1 hour let's say, it does an AutoClean stage, and then it stops for a bit. Like it cleans, stops tumbling, waits for like 2 minutes, then starts tumbling again with the condenser being off. Then after like 2-3 minutes the condenser starts again and goes on for an another hour. Maybe this is some kind of a cooling stage they added? I don't know, this also probably leads to different programming/software version.
 
I think the stopping in the auto clean stage is to stop water from being pulled through making clothes wetter again during the programme. Unlike self cleaning where the water runs off the fins immediately it may not in auto clean because it’ll put a thin layer on the filters which will need to ideally run off before it starts back up as the airflow would pull it through. That’s my guess anyway. Yes the Beko is also terrible at balling, since it reverses for only 3sec on any cycle apparently this has been changed now in new models but still wouldn’t touch one again
 
My exchanged device came

Hey y'all, the exchanged device finally arrived and it's not making the same noise. The first one wasn't doing it too but appeared after like 2 weeks. Let's hope this one will be normal and won't develop any noises 🙏🏻
 
Glad your new dryer doesn't make that noise. I tried the Mix cycle on mine, which got one software update probably a year or more ago, and it was a fail.
 
Reply to #40

Oh wow @logixx , I always thought Bosch/Siemens puts the software update to the menu only for the looks of it and never actually updates it's washing machines or dryers, you're the first person that i saw who said you received an update actually haha. I don't think that was a firmware update, maybe a security update. Because my friend who also has the same device as mine has the firmware version 2.0, and mine has 3.0 but he never received an update and it says he's up-to date, even though clearly mine is a newer firmware version. He says he never received an update before.

Btw, by fail, do you mean the front fan not turning on during Mix?

Also lastly, can we please compare “Mix cupboard dry +1” and “Cottons cupboard dry +1”, I would be so happy if someone can do this for me. I want to see which one gets less hot so I can use that instead. When I use Cottons it finishes much faster compared to Mix but I don't know if it's because it heats more or if it's because it doesn't overheat. Would be so happy if someone can try, thank you so much 🙏🏻
 
I received an update notification both via the app and on the dryer's display. I have no idea what the software update was about, as I didn't notice any changes. There is another YouTuber who had two or three cycles added to his dishwasher.

The Home Connect app gets frequent updates - usually making things worse, until errors eventually get sorted out.

I did try the Mix +1 cycle the other day and had to cancel it after about an hour because there was condensation leaking from the dryer - just like last time when I dried a large load using the cycle. I eventually had to use Timed Dry because every other sensor cycle I tried would shut off almost immediately, even though the clothes were still damp. The 40 min. timed cycle with Low Heat ended up reaching 69.8°C.

More on that after I get back from work.
 
My Siemens washer has received like 2 updates since I’ve had it and my Miele W1 has updated around 3 times since I got it in feb. I think the dryer has recieved 1 update and so has my fisher&paykel. Sadly won’t be able to tell you what cotton reaches as I never use the cycle, I don’t dry bedding in it at all and the rest go on mix or towels. It’s funny how my sisters Siemens washer dryer dries at a lower temp than your heat pump logixx but it does top at 71c at the very start and then cools to 62-64 for the remainder. It makes sense that nothing has shrunk since they were already being dried in the Bosch previously
 
What I wanted to see is how hot the Mix +1 cycle would get with a larger load. I had one fitted sheet, two pillow cases, to duvet covers and some other items in the dryer.

I allowed to cycle to run for about 70 minutes, before I canceled the cycle, as there were droplets of condensation on the wall and around the cycle selector (among other places). Clearly because the fan does not come on to pull air through the interior of the dryer itself. By the time I shut the dryer off, it had reached about 50C.

Both a Cotton Cupboard Dry and Extra Dry cycle were terminated after only a few minutes, despite the clothes clearly still being damp. I have seen this behavior in my previous Siemens before: cancel a cycle midway through and and you'll have to use timed dry to finish the clothes, as the sensors will get confused.

As stated above, after 40 minutes of "Low Heat" timed drying, the thermometer read almost 70C. That's probably the max the heat-pump can put out.

logixx-2022121505502704238_1.jpg

logixx-2022121505502704238_2.jpg

logixx-2022121505502704238_3.jpg

logixx-2022121505502704238_4.jpg
 
Reply to #44

Thanks for your test Logixx, but I think there's something weird with your device. Are you sure nothing's faulty there? I never had condensation leaking from my device, at worst, it dedects the water level at the bottom got too high and it pumps it up to drawer, or it starts the front fan. For example when I start a duvet program with a huge duvet that got spun in 800rpm, it finishes in like 3-4 hours with zero leaks outside of the device. But yours leak things even with sheets and pillow cases etc? It's weird in my opinion, I never saw moisture on the screen/buttona or on the outside of the device before.
 
It only happens on Quick|Mix. Other cycles will raise the humidity in my bathroom but there's no visible condensation. It all comes down to not running the fan and being rated B for condensation efficiency (87% condensation rate).
 
It's a lot about how big the room is, what your temperature in the room is etc.

Both my A class, 91% condensation efficiency dryers raised moisture in the bathroom noticeably.

My old bathroom was only 6m² (or 54 sqft) and being close to the coast, it was very humid. After each load I had to open the window.
Living down south again, my bathroom is a little bigger (8m² 72sqft) but you still feel the heat and moisture.

Again, it's just simple maths.
At 90% condensation efficiency, if you have an 8kg load spun at 1400rpm, that load has 4 liters of water in it at the beginning, and 400ml of that will make it into the room regardless.
 
Reply to #47 (Logixx)

Hi @logixx , yeah I bought them, and I'm using them since the replaced device came. So basically it has 3 or 4 filters right now. 2 double filter on the door (the ones that all the other models have, which I bought myself), 1 in front of the condenser, and one at the bottom which normally collects the wet fluff. And plus AutoClean on top of these of course.

A really interesting thing I noticed is, some fluff still somehow collects at the bottom wet fluff collector, and it's always in the middle part of it. This means that, some fluff still escapes the double filter on the door, then also escapes the condenser filter, and then it gets washed away with AutoClean from the condenser to the bottom of wet fluff collector. This shocked me at first, because if it's even escaping the filters I bought, I can't believe how people are normally using these devices without buying additional filters. No wonder why older SelfCleaning Condenser models were getting clogged after some time. What happens on mine is normal though by the way, because I clean the door filters after every use but I clean the other two bottom filters from month to month. So those wet fluffs are accumulated in over a month, and they're really rare. This shows the AutoClean is working great too, because it means all the fluff that still somehow escapes are getting flushed away to the bottom collector.

In conclusion, my condenser is looking ultra clean right now, and I think this (AutoClean + additinal double door filter) is the best solution in the market for fluffs right now, even better than Miele filtering (because in Miele if fluff somehow escapes, it doesn't gets washed away with the condenser). I was normally going to get an Electrolux/AEG dryer, but on those there isn't a condenser filter and even if there was one it wouldn't have been good like mine.

I know this was a very lengthy post, but I hope everything is clear :) Thank you
 
That's good to hear.

Yeah, there will always be lint that makes it past the filters. But your dryer should be very well protected now and you can see inside the condenser and evaporator to check for fluff.

I took the hose from my shower today (since my dryer is next to my bathtub) and blasted water into the condenser as best as I could. Despite me vacuuming the filters all the time, as well as the rubber seals, there was lint pumped into the water tank. I've been using the dryer for two years now, so I was expecting some lint.

Here are some stills from the video I took. The lint pictures (it looks like more lint than it actually is) are from the 1st and 3rd time ran the pump (in service mode). The last picture is how I rinsed the area. However, I had to turn the water way down.

logixx-2023010915161303932_1.jpg

logixx-2023010915161303932_2.jpg

logixx-2023010915161303932_3.jpg
 
My exchanged device came

Hey y'all, the exchanged device finally arrived and it's not making the same noise. The first one wasn't doing it too but appeared after like 2 weeks. Let's hope this one will be normal and won't develop any noises 🙏🏻
Hi!
Did the new dryer make that knocking sound?
I have a Bosch dryer that is 1 month old, and it makes a knocking sound when it heats up.
 
Back
Top