|Delonghi EC710 Coffee Maker Disassembly and Repair|
|Written by David Savery|
|Sunday, 14 December 2008 13:04|
In my case this morning the steamer was working but no water was coming out of the flow valve on the underside. This indicates water was getting into the boiler and was being heated up normally so it must be the flow valve at fault - probably encrusted with limescale.
Steps 11, 19 and 20 may be enough on their own to remove a clog from the flow valve without having to fully disassemble the machine. It's certainly worth a try before getting up to your elbows into the guts of your Delonghi. That said, if you have chunks of limescale lurking in your boiler, the flow valve will probably clog up again sooner or later.
Step 2. ... then lift and remove the arms.
Step 3. Remove the two screws on the base of the unit. Unlike in this photo I would recommend you avoid resting the machine on its back unless you are sure it has been completely drained. The black plastic base can now be pulled away allowing easier access to some of the screws that will be removed later.
Step 4. Undo the two screws on the top rear.
Step 5. Remove the coffee tamper by pulling and twisting.
Step 6. Remove the three screws. These are anti tamper screws and are star shaped with a nipple in the middle. Although I had a suitable bit that would fit these screws, the shaft of my screwdriver was too large to fit into the access hole. I managed to force these screws out using a small flat blade screwdriver which I was able to jam into the screws in order to get enough purchase to turn them. If you can't find a suitable tool to get these things out then it's a bit of a show stopper at this point. Upon reassembly I replaced these screws with normal Philips self tappers to make any future disassembly easier.
Step 7. With these screws removed, the top may be lifted away. The hotplate on the top section is still connected by a couple of thin wires so lift it carefully.
Step 8. To help with shifting the top out of the way, disconnect the hot plate/boiler heater connection. This will allow you to push the top of the unit away giving you the room you need to get inside.
Step 9. Unscrew the electrical safety earth and move the earth wiring out of the way.
Step 10. Use some long nose pliers to pull out the circlip that holds the boiler inlet pipe in place. Pull out the pipe to disconnect it from the boiler once the circlip has been removed.
Step 11. Unscrew, remove and clean the diffuser.
Step 12. Remove the two screws (arrowed red). The black plastic underside casing can now be pulled away (plastic tabs need to be pushed aside where arrowed in green)....
Step 13. Pulling away the plastic underside once screws and tabs are removed.
Step 14. Loosen the four black Torx (star shaped) boiler screws (front two arrowed). Water in the boiler may leak out at this point so ensure the unit is upright and a towel is placed underneath.
Step 15. Remove the four nuts (three arrowed) from the underside of the boiler unit.
Step 16. Lift up the top of the boiler assembly along with the steam outlet and place to one side. The two halves of the boiler assembly are sealed with a rubber gasket which should remain attached to the upper housing. Make sure this is properly in place when reassembling.
Step 17. The lower boiler assembly can now be lifted out.
Step 18. Here's my problem! Look at all that 'orrible limescale. It's bad enough having it lurking at the bottom of the boiler but as water is supposed to run down the channel in the middle (where the flow valve lives), I'm guessing that's clogged with the stuff too.
Step 19. With that yukky stuff cleaned out, turn over the boiler underside and unscrew the dowel.
Step 20. With the dowel removed the spring loaded flow valve can be taken out. It can then be cleaned along with the channel it sits in.
With cleaning complete, reassembly is the reversal of disassembly. As stated before, ensure the Torx bolts that hold the boiler together are secured tightly and that the rubber gasket is fitted correctly.
Once back together, it may take the pump longer than normal to refill the boiler as it is completely empty (normally some water from the last use would sit in the boiler).
A couple of useful links for those interested:
Exploded views and spare parts lists of several coffee machines including the EC710
Delonghi UK official product website
Enough talk... I need coffee....
|Last Updated on Tuesday, 17 March 2009 20:12|