Question about Bosch Tassimo TAS1000UC 1-Cup Coffee Maker

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My Bosch Tassimo machine is leaking out the bottom. Its quite a bit of water coming out (id say half a cup or so). Its not leaking into the resevoire but from the base of the machine itself. I have tried cleaning it, and I have just replaced the piercer (as the rubber was starting to erode). Anyone have any ideas on an easy way to fix this?

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Posted on Jan 02, 2017

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SOURCE: Bosch Tassimo machine leaking from inside! How do I dismatle it?

Before you attempt to dismantle the Bosch Tassimo, you need to determine how/where it is leaking. (1) Before making a drink with the unit remove the cup tray and ensure the bottom where it fits is dry. Replace the drink tray (2) Make a drink or use the cleaning disk, put a cup under as normal and start the cycle. (3) After the drink is made or a clean cycle remove the bottom cup tray and see if the bottom where it fits is wet.
If it's wet you have two (2) problems
(1) The pressure valve on the top of the heater is staying open, usually due to using water that has lots of calcium in it. (2) The pipe that leads from this pipe to the bottom tray is leaking (it's not a good fit in any of these machines, and causes water to drip from underneath.
Don't take it apart yet! Buy some de-scaler from and run this a few times, it should clear it. If it doesn't you have no choice but to open the thing.
If you have the model with a filter use it and change it when it tells you. If you don't have a built in filter, don't use water directly from the tap, run water through a Brita filter or similar
If the bottom tray doesn't get wet, take it apart to see where it's leaking. 99.99999999999999% of the time it the valve.

So how to take the thing apart.
(1) The sides (silver or black) slide to the rear. However, you have to put something in the back between the side and the rear cover to pry them apart while pushing to the rear. It's very difficult. I use a 6" steel ruler. You have to bend the sides to overcome the catches that hold them in place. You'll see a small rectangular slot at the back of each side. They will come off eventually.
(2) Once off you'll have to remove the lid where you put the disc in. Remove the 4 screws under the lid deck. (3) Remove the water pipe screws (2) and the bar code scanner screws (2). Be careful of the barcode scanner the cable is very, very delicate (I always unplug it from the circuit board and remove it completely, lift the black tabs at either side of the cable). Lift of the lid assembly. (3a) Remove the screw from the underneath the unit at the back, this allows the front to move out. (4) At each corner of the top carefully pry the locking mechanisms until the top is free. Remove the pink (thick) pipe and the pink (thin) pipe and turn the top around out of the way of the heater unit. A coiled steel spring will drop out, it's easy to replace when the top is back on. (5) Where the thin pink pipe goes to is a back pressure release valve carefully pry the clips apart and remove. Take out the rubber O-ring and the valve. Carefully remove any calcified deposits from under the rubber (blue) valve. (6) Reassemble valve (7) Reassemble top, and lid taking care with the bar code reader. (8) Test before replacing the sides
The thick pink pipe that descends from the top, that you removed earlier goes to the bottom tray, you will notice it is very loose (they all are) and it leaks. Put a tie wrap around it to seal it.
Good luck, it's not an easy fix, they were never meant to be taken apart to be repaired - not very ECO friendly. Let your MP/Congressman know, these should end up in a landfill because of 50 cent valve, and they don't come apart.

Posted on Aug 22, 2010

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SOURCE: Tassimo machine leaking water underneath

I'm having the same problem with my machine. I rang the Tassimo careline and they told me to descale the machine but, so far, this has only made matters worse. I'm now going to take it back to where I got it from because it's still within its warranty.

Posted on Nov 20, 2009

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Bosch tassimo T65 - water draining in to drip tray possible cause and resolution

I had a problem on my Tassimo T65 where water was entering the bottom drip tray through the small hole at the rear. It seems many people have this problem but after researching on line there is little help although I found on this sit how to take the coffee maker apart and from that thread the possible cause for my own issue.
So if your machine seems to be leaking from the small drain hole to the rear of the drip tray try this before you think it is either in need of specialist repair by Bosch at a cost almost the same as a new machine or before you start to take it apart and have a look yourself.
CAUSE - The water is coming from the drain hole because the pressure valve at the top of the machine is blocked with calcium deposits through prolonged use without descaling sufficiently.
SOLUTION - Purchase a good quality coffee machine descaler. Sit the whole coffee machine in a tray or large oven tray so you can collect the overflowing descaler throughout the process, it's not economical to waste this solution. Remember to clean down and dry the coffee maker each time.
Use at least half strength descaler do not water it down more than 1:1
Follow the descaling process by inserting the yellow disc and holding the start button down for 3 seconds.
Repeat this process several times, recovering the fluid leaking in to the tray and cup or container. If you start to see small lumps being dispelled in to the cup try to remove these for further descaling.
After several cycles you should notice that the leaking or flow of water from the bottom drain hole becomes less until it stops. To force the dissolving scale out of the pressure valve try running the normal clean cycle but with the descaling solution, the flow is longer and will help flush the restriction.
After a number of descaling and clean cycles the leak or flow from the drain hole will have stopped, if not continue till it does.
Note: I ran cycles for about 2 hours with periods of rest to allow the solution to do its work.
Now the leak or flow has stopped clean out the reservoir and replace with clean water and run at least 4 clean and rinse cycles.
i hope this works for you and now enjoy your coffee.

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