DeLonghi ETAM upper brewing piston repair

はじめに

Unfortunately, the upper piston is not reached by the descaling and cleaning program. If it is dirty/calcified, the machine will no longer function properly. It can be replaced or revised. This is shown here.

必要な工具と部品

手順1 DeLonghi ETAM Opening side panels

DeLonghi ETAM upper brewing piston repair, DeLonghi ETAM Opening side panels: 手順 1、 2の画像 1

DeLonghi ETAM upper brewing piston repair, DeLonghi ETAM Opening side panels: 手順 1、 2の画像 2

Disconnect the power plug and remove the power cord from the device.
Remove all coffee beans. Remove all attachments such as drip tray, milk frother and water tank. Open the service door and remove the brew group.
Unscrew the two Phillips screws
The Phillips screw under the water tank can remain.

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手順2

The bean compartment flap must be removed. It is latched on the left and right, the latch is held under tension by a spring. Compress the spring until the catch is free and lift off the flap.

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手順3

DeLonghi ETAM upper brewing piston repair: 手順 3、 3の画像 3

There is a plastic cover strip under the flap. It is only latched in place. Release it with a flat tool and lift it out.

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手順4

Lift the back side up and put it aside.

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手順5

The side covers are still attached to the back with two screws. They are located under a cover strip that is only snapped in place. Take off the cover strip and put it aside.
Unscrew the two Phillips screws.

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手順6

Push the left side panel back about 1 cm. It often jams strongly and you have to help it with a plastic opening tool.
Remove the left side panel.

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手順7

The right side panel is removed in the same way, but the service hatch is a bit obstructive. Open it first and push the side panel back a few millimeters. This is often difficult and you will need a plastic lever tool.
Close the flap again and push the sides further back. It is a bit tricky and you have to work carefully. Lift out the side panel.

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手順8 DeLonghi ETAM series top removal

DeLonghi ETAM upper brewing piston repair, DeLonghi ETAM series top removal: 手順 8、 2の画像 1

DeLonghi ETAM upper brewing piston repair, DeLonghi ETAM series top removal: 手順 8、 2の画像 2

Some devices have a warming plate. Disconnect the flat plugs on the green/yellow protective earth conductors.
When reassembling, don't forget to put them back on.

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手順9

The top is fixed with screws on the left and right, depending on the type. Unscrew them.
Now the top can be gently lifted off.
Depending on the type, it is shaped differently. Some have the control panel far to the rear. Leave it for now, it is connected with cables.

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手順10 DeLonghi ETAM series control panel removal

DeLonghi ETAM upper brewing piston repair, DeLonghi ETAM series control panel removal: 手順 10、 1の画像 1

The control panel is locked very tightly with four catches on the front. It is tricky to release these latches and you need quite a lot of force.
First loosen the detent on the edge. Use a thin flat-blade screwdriver to drive under the latch from behind. Insert a strong plastic lever tool into the gap between the control panel and the front. The latch opens with a loud crack.
Now you can open the other latches with the lever tool
Do not remove the control panel completely yet, it is still connected with cables.

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手順11

Lift up the control panel a little. Press the latch on the white plug and pull off the plug.
Unthread the ribbon cable that leads to the control electronics at the back as far as possible. This will make it longer and you can place the control panel on its side.
If you want to remove the control panel completely, you have to take off the cover on the control electronics and disconnect the connector. Then you can unthread the cable completely.

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手順12 Replace top brewing piston

DeLonghi ETAM upper brewing piston repair, Replace top brewing piston: 手順 12、 3の画像 1

DeLonghi ETAM upper brewing piston repair, Replace top brewing piston: 手順 12、 3の画像 2

DeLonghi ETAM upper brewing piston repair, Replace top brewing piston: 手順 12、 3の画像 3

There are six connections on the upper brewing piston: three hot water pressure lines, one non-pressurized waste water line, a hose line to the coffee spout and two cables to the microswitch. All must be removed first.
Pull out the clip at the top left and loosen the pressure line. Pay attention to the O-ring. It either hangs on the line or afterwards. When reassembling, replace it with a new one if possible.
Pull out the clamp in the middle and loosen the pressure line. Pay attention to the O-ring. It either hangs on the line or afterwards. When reassembling, replace it with a new one if possible.
Pull out the clamp on the bottom left and loosen the pressure line. Pay attention to the O-ring. It either hangs on the line or afterwards. When reassembling, replace it with a new one if possible.

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手順13

Disconnect the two spade connectors from the microswitch

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手順14

Take off the black bend protector on the middle pressure line.

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手順15

Unscrew the two Allen screws (4 mm).
Lift off the stainless steel bracket.

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手順16

Unscrew the Phillips screw on the black protective plate on the left and pull off the protective plate.

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手順17

Using a flat tool, disconnect the drain hose on the left.

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手順18

Remove the two Phillips screws securing the side of the upper piston support plate.
The screws are in deep holes.

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手順19

Pull off the hose to the coffee spout.
Pull out the pressure hoses that are in the way,through the openings on the left.
The upper piston support plate is now free. However, it is very tight and it is tricky to get it out. Be patient and work carefully. Make sure that the ribbon cable to the control panel is not damaged.
It'll be easier if you also detach the front panel and remove the coffee spout.

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手順20 Repair upper brewing piston

DeLonghi ETAM upper brewing piston repair, Repair upper brewing piston: 手順 20、 2の画像 1

DeLonghi ETAM upper brewing piston repair, Repair upper brewing piston: 手順 20、 2の画像 2

The piston is attached to the gray plastic part with a small ring retainer. Push the fuse to the side and store it well.
Turn the piston around. There is a recessed Torx T10 screw in the exact center. Unscrew it.

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手順21

Unscrew the two Phillips screws on the piston and remove the black cover.
Remove the large O-ring on the piston.
Unscrew the single Phillips head screw in the center of the piston.

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手順22

Gently pull off the plunger. Note the springs inside.
Also pay attention to the spring with the valve hemisphere. When assembling, the ball must point upwards.

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手順23

Turn the piston over and remove the attachments:
Unscrew the two Phillips screws on the valve and remove the valve.
Unscrew the two Allen screws (2 mm) on the raccord and remove the raccord.
Unscrew the single Phillips head screw on the microswitch and lift the microswitch out.

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手順24

DeLonghi ETAM upper brewing piston repair: 手順 24、 3の画像 3

Thoroughly degrease and descale all parts. If possible, replace the O-rings. Re-grease them and reassemble the upper piston.
Note the valve: the plunger points upwards.
The maintenance kit contains a total of 18 seals for the upper piston, plus two for the lower piston.