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  • Gaggia Classic constantly backflows

    Hi all, have been reading the site for a while and now have an issue hoping you have some advice on.

    I have a 7 year old Gaggia Classic that recently started acting up:
    1. I turn it on to heat up
    2. I flick the flow switch and the pump starts
    3. About half a second after the pump starts I hear a small click and water starts flowing back into the water reservoir.

    The above occurs if the unit is cold or warmed up, and if I have a loaded PF, or no PF at all.

    Does this sound like something I can easily repair myself? If not, can anyone recommend where to take it to for repair in Melbourne. I am in North Melbourne near Vic Markets and if I take it for repair would also be interested in a service centre that could give it a general service, clean, and (am I dreaming?) adjust the OPV to perfection :-)


    Cheers,
    JR

  • #2
    Re: Gaggia Classic constantly backflows

    Has it been for a service at all in the past 7 years? Not sure who to take it to in Melbourne, maybe one of the site sponsors can help you with that information. My guess is that it will probably need some gaskets etc replaced too.

    Good luck.

    Comment


    • #3
      Re: Gaggia Classic constantly backflows

      Ill take a wild stab at this one.

      Your solenoid valve is clogged or OPV is faulty.

      You should descale your machine immediately..try using 1 tblsp. of citric acid to one litre of water. You can read up more on blogs by doing some research.

      cheers!

      Comment


      • #4
        Re: Gaggia Classic constantly backflows

        Do not use citric acid - it will kill your boiler - I am dead serious about this, aluminium + citric acid is bad news.

        Get some caffetto espresso cleaner from coffeeparts (site sponsor) or your nearest coffee machine/acessory supplier.

        Comment


        • #5
          Re: Gaggia Classic constantly backflows

          Grouphead cleaner/Backflushing detergent and Descaling solutions are not the same animals. Do not use grouphead cleaner/backflushing detergent for descaling!!


          Java "You dont want to go down that road!" phile
          Toys! I must have new toys!!!

          Comment


          • #6
            Re: Gaggia Classic constantly backflows

            Slow down everyone.

            Deep breaths.

            Id start with Grouphead cleaner/Backflushing detergent.

            If theres no improvement then look to descale and as Cindy said, do not use citric acid on the Gaggia.

            A search of the site should find the thread that went into detail about that or else Cindy might beable to refresh our memories.

            Comment


            • #7
              Re: Gaggia Classic constantly backflows

              Originally posted by Thundergod link=1193099616/0#5 date=1193139563
              If theres no improvement then look to descale and as Cindy said, do not use citric acid on the Gaggia.
              A search of the site should find the thread that went into detail about that or else Cindy might beable to refresh our memories.
              Thanks Thundergod. I think the thread you mean is this one:
              http://coffeesnobs.com.au/YaBB.pl?num=1175847187/0 - A very good and important read for all.

              Thankyou all for your advice. I grabbed some Cafetto from Ricky, not too far from me at Home Barista Institute in North Melbourne. I descaled the machine to death, but no joy. I can get water to flow from the reservoir through to the wand no problems. But as soon as I turn the wand tap/dial/black-knob/whatever-its-called off, the water just starts recycling into the reservoir.

              In 7 years I have never had the unit serviced so it seems now is a good time to do that (and get it fixed). I have been referred to Con in Bay Street, Port Melbourne - TWENTY SEVENTH HARWUN PTY LTD as listed on http://www.gaggia.net.au/service.html

              Cheers,
              JR
              ---
              Gaggia Classic, Gaggia MDF Grinder
              Need to change your Gaggia Classic Group Gasket: Heres a quick guide:
              http://www.bluebox.com.au/jcrayon/gaggia/index.htm

              Comment


              • #8
                Re: Gaggia Classic constantly backflows

                Please help
                Where do you get (buy) Citric Acid.  I ask at our hardware store they looked blank and  suggested an orange!

                It has been mentioned quite often on this site as an excellent descaler.
                Sorry to be  bit off the subject.
                dumiya

                Comment


                • #9
                  Re: Gaggia Classic constantly backflows

                  Your local supermarket.

                  Comment


                  • #10
                    Re: Gaggia Classic constantly backflows

                    Originally posted by Coffee Kid link=1193099616/0#8 date=1194525370
                    Your local supermarket.
                    Or Home Brew Supplies shop......

                    Mal.

                    Comment


                    • #11
                      Re: Gaggia Classic constantly backflows

                      This is why you should not use citric acid

                      quote - Java B
                      Because HALF of the boiler is made of Aluminium.... and it would be badly attacked by acid in any case!

                      But Gaggia saw fit to make the other half out of brass.... so you get electrolytic action and corrossion with just water containing ions..... any ions....

                      But add acid..... and you have galvanic corrosion paradise..... with the aluminium being the sacrificial anode.....

                      So the only thing which will remove a carbonate build up - i.e. acid..... will also destroy the boiler

                      For those of us who are techno geeks

                      Galvanic voltage:
                      Aluminium 0.95V
                      Brass 0.4V

                      and metals more than 0.15V apart should not be joined in a wet, slighly corrosive environment, 0.25 for reasonably dry environments and 0.5V in a controlled temperature and low humidity environment...

                      And in the boiler - wet and corrosive - we have 0.55V



                      If you want to shorten the life of your boiler, than by all means use citric acid. It is a cheap methood that could have an expensive outcome eventually.

                      Comment


                      • #12
                        Re: Gaggia Classic constantly backflows

                        6910 manual says vinegar is a idea for descale - i assume by the above you cant use this on gaggia?

                        Comment


                        • #13
                          Re: Gaggia Classic constantly backflows

                          Originally posted by gaggiaboy link=1193099616/0#11 date=1194781496
                          6910 manual says vinegar is a idea for descale - i assume by the above you cant use this on gaggia?
                          Well vinegar is acetic acid...... and also the 6910 thermoblock tubes are lined with stainless steel.... very resistant to any form of attack - including acid.....

                          The gaggia boiler is brass/aluminium...... so nope.... vinegar isnt a good idea!

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