Siemens Surpresso Compact Boiler replacement - iFixit Repair Guide

Introduction

If the boiler is clogged (from lime) or the heater stops working, then it must be replaced. This is shown here.

Note: the pictures are from the almost identical Melitta Caffeo. The only major difference is that the thermoblock is installed rotated by 90 °.

What you need

Step 1 Opening the Siemens Surpresso Compact

Siemens Surpresso Compact Boiler replacement, Opening the Siemens Surpresso Compact: step 1, image 1 of 1

Unplug your coffee maker!
Remove the water container, the brew group and the drip tray with pomace container.
Using a spoon, remove as much of the coffee beans as possible from the coffee bean container.
Depending on the model, additional sensors with cables may be installed on the top and side panels. You have to remove these before you can completely remove the housing parts.

Step 2

Siemens Surpresso Compact Boiler replacement: step 2, image 1 of 1

Remove the two Torx T10 screws on the top.

Step 3

Siemens Surpresso Compact Boiler replacement: step 3, image 1 of 2

Siemens Surpresso Compact Boiler replacement: step 3, image 2 of 2

Remove seven T10 Torx screws on the back.
The two screws at the bottom of the front can remain.

Step 4

Siemens Surpresso Compact Boiler replacement: step 4, image 1 of 2

Siemens Surpresso Compact Boiler replacement: step 4, image 2 of 2

Press with a flat-head screwdriver into the openings on the side with the water tank. This releases the latches on the top.
Press the flat-head screwdriver into the opening on the side with the brew group. This will release the last notch on the top.
Lift the top off.
On some models, a cable leads to the sensor on the powder tray. Unplug the connector on this cable first.

Step 5

Siemens Surpresso Compact Boiler replacement: step 5, image 1 of 2

Siemens Surpresso Compact Boiler replacement: step 5, image 2 of 2

Slide the side section of the brewing unit about 2 cm to the rear. This sometimes gets stuck and may require some force to remove.
Remove the two tabs from the power switch.
Take off the side panel with the brew group.

Step 6

Siemens Surpresso Compact Boiler replacement: step 6, image 1 of 1

Do the same with the panel on the other side.
To remove the water tank hose simply pull it of the pump.
Remove the side panel.

Step 7 Heater

Siemens Surpresso Compact Boiler replacement, Heater: step 7, image 1 of 1

The photo shows the old and the new heater next to each other. Mostly you have to transfer add-on parts (cable sleeve, screws, and clamping plates) from the old part to the new part.

Step 8

Siemens Surpresso Compact Boiler replacement: step 8, image 1 of 2

Siemens Surpresso Compact Boiler replacement: step 8, image 2 of 2

Unscrew three Torx T20 screws.
Remove the clamping plates of the thermal fuses and the grounding lug on the green/yellow cable.
The screws and the clamping plates must be transferred to the new part.
Carefully pull off the two flat plugs at the heater connection.
Later, also transfer the black rubber grommet - if present - at the heating connection to the new part.

Step 9

Siemens Surpresso Compact Boiler replacement: step 9, image 1 of 1

Loosen the retaining screw of the instantaneous water heater with a 4 mm Allen key.
The lock nut of the screw sits loosely in the black plastic housing and can fall away to the rear. If you pull on the screw while unscrewing it, this will not happen easily.
Carefully pull the thermoblock out to the front. Do not remove it completely yet, it is still connected to the thermosensor and the pressure hoses.

Step 10

Siemens Surpresso Compact Boiler replacement: step 10, image 1 of 1

Pull out the clips on the two pressure hoses and remove the two connections.
The two connections are sealed with an O-ring. Replace them during reassembly.

Step 11

Siemens Surpresso Compact Boiler replacement: step 11, image 1 of 1

Now the thermoblock is only attached to the thermosensor. Unscrew it with an open-end wrench SW8. Make sure that the fragile cables are not twisted and torn off.

Conclusion

Follow the steps in reverse order to reassemble your device

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