Introduction
Many models of Jura Krups or AEG coffee makers have this "thermoblock" installed. You have to replace it if the coffee is too cold or the flow is - mostly disturbed by limescale. Older models are equipped with another type of heater if so use this guide.
Tools
Parts
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The instructions are suitable for nearly every model of Jura and similar ones e.g. AEG and Krups.
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Remove the water reservoir.
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Using an oval head bit you can screw them out. If you haven´t got one you can carefully use pliers. It is a good idea to later change the screws for normal ones.
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Beneath both top side covers are two Torx T15 screws. Remove those. Now lift off the whole top cover. Sometimes it jams and you have to use a bit of force.
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The side covers must be pushed backwards by about 1 cm. Sometimes this is a little bit difficult to move. If necessary, wedge a plastic opening tool into the gap between the side covers and the front panel. The rear cover can be easily removed.
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The block is marked red here.
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There are three connections for water or steam.
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Three cable feeders.
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A thermocouple.
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First, pull the clips on the tubing connectors, then pull out the tubing.
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Then remove the power cables: A gray cable leading to the thermal fuse, a blue one directly from the heater (can also be pulled later) and the green-yellow protective cable is unscrewed.
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Two small blue cables lead to the temperature sensor, it is unscrewed.
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The hexagon screw in the middle can be loosened.
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Unscrew the tube holder, then the block is free.
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Here lies the block. If you are lucky you can push out blockages from the openings with a wire. Mostly that does not work. The block can not be opened and must then be replaced.
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This is the thermal fuse. First remove the cable lug, then unscrew and fix together with the cable on the new block, as well as the yellow-green protective cable.
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For mounting, the light carrier must be pulled out by loosening the marked screw.
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It is attached with two hooks, you can lift them with a screwdriver.
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The steam valve is actuated by a plastic disc with a cross-shaped cut. To loosen, you have to pull the whole front wall carefully outwards, then you can pull out the entire unit.
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Now you can see why all this was necessary: on the back of the carrier is a recess. Inside is loosely the lock nut to the big screw with which the block is attached.
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Thus, first the new block is screwed into the carrier.
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And now go through all the steps again in reverse order!
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Repeat the steps in reverse order to reassemble your device.