Question about Bosch Tassimo TAS1000UC 1-Cup Coffee Maker

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The removable water tank on my Bosch Tassimo is leaking...I descaled and now it is leaking even more.

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Posted on Jan 02, 2017

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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

  • 1 Answer

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 AP-Wagner.com 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

  • 5059 Answers

SOURCE: how much bicarb of soda do i use to descale my bosch tassimo

Sodium bicarbonate is not a descaling product. It makes a nice minimally abrasive cleaning agent when mixed as a paste. Sodium ions will exchange with calcium in a water softener when the calcium is dissolved in water. Once the calcium salt (calcium carbonate) forms, it doesn't go back into solution in a neutral or basic environment. A bicarbonate solution will be basic.

Descaling requires an acid. The Tassimo products say "Do not use vinegar" (acetic acid). I suspect they use citric acid in their descaling product. You can try the lemon-flavored Kool-aid (the version packaged in the envelopes that needs a sweetener added when it's a drink). Mix 1 tablespoon of the powder in 1 pint of water. However, you'll need to make more than a pint of the solution since you need 500 ml of liquid per cleaning cycle. (1 pint is ~473 ml.)

I hope this helps.

Cindy Wells

Posted on Apr 25, 2012

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2 Answers

The red light won't go off even after refilling the water tank and changing the filter


Which red light? The descale light or the water level light? both are red. If the first, you need to go through the descale process as described in http://www.manualowl.com/m/Bosch/TAS4511UC/Manual/216487 If the refill lamp lights, there may be a fault, but try the descaling process anyway.

Mar 10, 2015 | Bosch Tassimo TAS4511UC Coffee Maker

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Descale T20 Bosch Tassimo


you need to use the cleaner disk (tucked into the back of the machine) and run through some of the cleaner solution. Then run though just water. Don't forget to store the cleaner disk back in the machine.

Sep 09, 2014 | Bosch Tassimo T20 Single Serve Brewer,...

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Why standby light active and water tank fill light is blinking ?


It shouldn't harm it plus if the scale is affecting the switch for the watertank then it should sort it out....

Jul 25, 2014 | Bosch Tassimo TAS4011GB Coffee Maker

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Fill tank& descale keep flashing.


Fill the reservoir with white vinegar and run a cycle. Discard the vinegar and repeat the process a second time. that should remove the scale and reset the flashing light.

May 19, 2014 | Bosch TAS2002GB Tassimo T20 Hot Beverage...

1 Answer

The 7d(fill tank light) & 7e(descale light) are flashing simultaneously, what to do?


According to the manual, when both lights 7d and 7e are on at the same time, you need to contact Tassimo.

Sep 30, 2012 | Bosch Tassimo TAS1000UC 1-Cup Coffee Maker

1 Answer

How much bicarb of soda do i use to descale my bosch tassimo


Sodium bicarbonate is not a descaling product. It makes a nice minimally abrasive cleaning agent when mixed as a paste. Sodium ions will exchange with calcium in a water softener when the calcium is dissolved in water. Once the calcium salt (calcium carbonate) forms, it doesn't go back into solution in a neutral or basic environment. A bicarbonate solution will be basic.

Descaling requires an acid. The Tassimo products say "Do not use vinegar" (acetic acid). I suspect they use citric acid in their descaling product. You can try the lemon-flavored Kool-aid (the version packaged in the envelopes that needs a sweetener added when it's a drink). Mix 1 tablespoon of the powder in 1 pint of water. However, you'll need to make more than a pint of the solution since you need 500 ml of liquid per cleaning cycle. (1 pint is ~473 ml.)

I hope this helps.

Cindy Wells

Apr 24, 2012 | Bosch Tassimo TAS4011GB Coffee Maker

3 Answers

Tassimo red light stays on ran descaling disc twice


After many months, I solved the problem of the red light staying on the Tassimo Coffee Maker. Use these easy steps.
1. Fill a 2 cup measuring cup with hot water.
2. Mix in descaler.
3. Pour in the empty water tank.
4. Put the yellow cleaning disk in the chamber and close chamber. Put the two cup measuring cup under the spout.
5. Push and hold the brew button for about 3 seconds (until the red and green light flash.
6. Now don't touch the machine. It will do it's thing for about 20 minutes. (Don't be impatient and start to push buttons, just leave it)
7. When it finishes it's cycle. The red light will turn off. Then clean the water tank and put fresh water and run clean water through the brewing cycle 4 times. Your machine is now ready for use.

Sep 23, 2010 | Bosch Tassimo TAS4511UC Coffee Maker

1 Answer

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.

Oct 06, 2009 | Bosch Coffee Makers & Espresso Machines

2 Answers

My tassimo brewer is by Bosch and it has a filter with it, will I still need to descale also?


definately, follow the mfg suggested cleaning in you booklet. the filter will not filter out hard water particles.

Oct 04, 2009 | Braun Tassimo Coffee Maker

1 Answer

Bosch tassimo


Solution: Just refill the water tank with water (no descaling solution) all the way to the "Max Line". Then run the full descaling program again --takes approx. 20 minutes. After the program runs completely you will get the yellow "standby" light on and the red "descaling" light will be off.

Next time you descale, be sure and fill your water tank to the "Max Line" before running the descaling program.
Hint: An incomplete cycle (not full tank) is what makes the red light stay on. In other words, it's staying red to tell you to run a full cycle (beginning with the water tank filled to the "Max Line"). Hope this tip is helpful!

Sep 03, 2008 | Braun Tassimo Espresso Machine/Coffee...

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