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  • Bezzera BZ99 Issues

    My beloved BZ99 has started playing up a few days after descaling.

    The machine is heating very slightly but 60 minutes after start up the group head is only warm, I have no steam and no hot water. I can draw water out of the group head, it's warm (not hot though) at the start but then just room temp afterwards and does not heat back up to warm temp. This started 4 days ago. 2 days ago the machine stared up and worked perfectly. After that it hasn't worked again since.

    I'm hoping that it's just the heating element? Any ideas would really be appreciated.

  • #2
    G'day Nick...

    Could be down to a stuck-closed Anti-Vac Valve.
    With the valve closed before heating, the air pressure builds up in the closed boiler prematurely shutting power to the boiler. With the power Off and unplugged from the socket, remove the covers and then identify the valve. Remove it and then carefully disassemble and clean, then reassemble (with a new O-Ring if required) and refit to the boiler.

    The Anti-Vac Valve fixture is circled in Red and the Valve itself is circled in Blue on the attached PDF. The boiler depicted is not identical to your BZ99 but the valve fixture should be very similar.

    Hopefully everything will now be back to normal and you can start hitting espressos again.

    Mal.
    Attached Files
    Last edited by Dimal; 6 January 2019, 04:35 PM.

    Comment


    • #3
      Thanks for getting back to me Mal,

      I'm at work this morning so will see if this fixes the problem when I get home. Fingers crossed that it does the trick

      Comment


      • #4
        Originally posted by Dimal View Post
        G'day Nick...

        Could be down to a stuck-closed Anti-Vac Valve.
        With the valve closed before heating, the air pressure builds up in the closed boiler prematurely shutting power to the boiler. With the power Off and unplugged from the socket, remove the covers and then identify the valve. Remove it and then carefully disassemble and clean, then reassemble (with a new O-Ring if required) and refit to the boiler.

        The Anti-Vac Valve fixture is circled in Red and the Valve itself is circled in Blue on the attached PDF. The boiler depicted is not identical to your BZ99 but the valve fixture should be very similar.

        Hopefully everything will now be back to normal and you can start hitting espressos again.

        Mal.
        Mal, just wanted to say thank you for the advice.

        Removed the Anti-Vac Valve and gave it all a clean and wash out, there was a bit of crud hanging about so hoping that was the issue. Started the BZ99 up, anti-vac was open and closed off at about the 4 or 5 minute mark. Produced a great shot from some new beans I've only been able to have with an aeropress. Tested the steam and hot water, both working as should be. I'll go with a tentative problem solved and hopefully the machine does the same tomorrow morning before work

        Nick

        Comment


        • #5
          Originally posted by nickrauksts View Post
          Mal, just wanted to say thank you for the advice.

          Removed the Anti-Vac Valve and gave it all a clean and wash out, there was a bit of crud hanging about so hoping that was the issue. Started the BZ99 up, anti-vac was open and closed off at about the 4 or 5 minute mark. Produced a great shot from some new beans I've only been able to have with an aeropress. Tested the steam and hot water, both working as should be. I'll go with a tentative problem solved and hopefully the machine does the same tomorrow morning before work

          Nick
          Good stuff Nick, Mal's a pretty clue'y/helpful bloke, let's know if the fix holds up in the AM.

          Comment


          • #6
            Aw shucks Yelta, thanks for the complement.

            Most welcome Nick. Hope it keeps on keeping on...

            Mal.

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            • #7
              Mal is certainly a brains trust member on here. A Guru!

              Comment


              • #8
                Originally posted by Yelta View Post
                Good stuff Nick, Mal's a pretty clue'y/helpful bloke, let's know if the fix holds up in the AM.
                Couldn't agree more, don't know how many hundreds of posts/comments I've read from Mal.

                Unfortunately the BZ was playing up again this morning. Started up, boiler drew water and I could hear the boiler heating. Anti-Vac was open and closed off at around the same time (4 or 5 mins) as yesterday arvo. Interestingly just as I went to make my espresso the valve re-opened (around 40 mintues from startup) and stayed open which didn't happen yesterday.

                Group head was really hot but water definitely wasn't at brew temp and no steam or hot water. I ran water theough the group, boiler drew more water but couldn't hear the boiler reheating at all.

                Wondering if I should order a new anti-vac valve and see if the problem persists after that as it's pretty cheap anyway?

                Comment


                • #9
                  Originally posted by nickrauksts View Post
                  Wondering if I should order a new anti-vac valve and see if the problem persists after that as it's pretty cheap anyway?
                  Morning Nick, bad luck the fix didn't hold, a new valve would certainly be my next step.

                  Comment


                  • #10
                    Coffeeparts has one that plumbs into drip tray so it doesn't sputter about under the hood of your machine.

                    Or is it espressoparts... Site sponsor anyway
                    Last edited by Jackster; 7 January 2019, 12:18 PM.

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                    • #11
                      Originally posted by Jackster View Post
                      Coffeeparts has one that plumbs into drip tray so it doesn't sputter about under the hood of your machine.

                      Or is it espressoparts... Site sponsor anyway
                      That would be great, is this the one: https://www.coffeeparts.com.au/61896...__store=online

                      If thats it do I then just run a hose from the top to the drip tray?

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                      • #12
                        Yes mate...

                        That would work well.
                        Should last a long time too and probably serviceable as well.

                        Mal.

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                        • #13
                          Will order it today, hopefully will have it by Friday and will then have coffee on the weekend

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                          • #14
                            Originally posted by nickrauksts View Post
                            Will order it today, hopefully will have it by Friday and will then have coffee on the weekend
                            Hope you have better luck than I have with Auspost of late, bloody hopeless.

                            Comment


                            • #15
                              Originally posted by Yelta View Post
                              Hope you have better luck than I have with Auspost of late, bloody hopeless.
                              Oddly enough Aus post have been good to me lately considering the xmas period.

                              Most of the time it takes a few days to get things from Brisbane and I'm only a 2.5 hour drive away.

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