Introduction
The pulsation damper/pressure relief valve may be faulty, e.g. due to limescale. Remove it, check it or replace it.
''These instructions can also be used with other Siemens/Bosch models - the models have a similar structure.
Parts
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Remove all attachments such as water tank, pulp drawer, brew group.
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Remove the coffee container lid and take out all the coffee beans.
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Lay the machine on its side with the water tank side facing up.
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The side panel is essentially held on the ground by five strong catches. Pry up the pegs with a strong prying tool. It's pretty difficult and you need a lot of strength.
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If the catches are loose, you can pull the side panel away from below. But it's still stuck in other places.
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Use a plastic tool to pry the top cover up a few millimeters and lift off the side panel. Most of the time it's still stuck, especially at the front edge, you have to pull hard.
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You may need to pry the front edge with a plastic tool.
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Lift the side panel off, but don't remove it completely yet. It is still connected with a silicone tube.
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The water tank lid is located at the top of the side panel. Lift it up off the hinges.
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Remove the cover over the electronics.
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The second picture shows the most important components:
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heater
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Ceramic valve/Brew valve (depending on model)
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electronics
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pump
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mute
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flow meter
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The pulsation damper is mounted directly above the pump.
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Pull off the clear hose.
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Loosen the hose clamp on the red pressure hose and pull off the hose
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Lock the outlet connection of the pump with a 12mm box-end wrench
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Unscrew the valve. If it is not easy, you can also loosen the bayonet on the connection for the clear hose. Caution: a spring and a valve tappet may fall out.
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The valve may just be calcified, in which case place the insides in a descaler. If you blow into the valve from the pump side, there should be hardly any resistance.
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Work through the steps in reverse order to reassemble your device.
