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Breville Dual Boiler BES900 pressure issue

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  • Breville Dual Boiler BES900 pressure issue

    Hi everyone

    I recently got bought a second hand BES900. I got it service (by someone not so knowledgeable apparently) and when I got it back, began dialing it in.

    I got it dialed in but after a few days, I started noticing my machine playing up with pressure while extracting.

    I’ve noticed this issue usually happened after the machine has been on for a while, it never happens if I pull a shot the moment the machine is at temp.

    I have heard it may be the pump, but could it be the 3 way solenoid too?

    Video here - https://youtu.be/AlqPy-q56_o

  • #2
    That's pretty weird. But yes most likely the pump. It doesn't even appear to try under preinfusion, which is either the pump or the part of the control board that governs preinfusion. I'd replace the pump as first port of call. The other thing that could have gone is the OPV. They're pretty inexpensive so worth doing at the same time as they're attached to the pump.

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    • #3
      2nd the pump.

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      • #4
        Thank you for the replies

        I’ll look into getting a new pump

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        • #5
          Interesting issue. I'm having a potentially related issue with slow pressure build (when using the blind basket) maxing out at 7bar at 20 seconds. Can't get above 3 bar with grounds. When the pump does get to 7ish bar, I get it bouncing off the OPV - not as extreme as your issue as it doesn't drop back down to zero. Assume it's either the pump or OPV or both?, so have ordered a replacement brass neck pump and brass OPV from coffee parts on eBay and will install next week. Will replace the solenoid gasket at the same time to make sure there aren't any blockages to the water flow - and will slayer mod while I'm in there. Will let you know how it goes.

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          • noidle22
            noidle22 commented
            Editing a comment
            Slow ramp to full pressure or failure to maintain pressure is nearly always a blocked solenoid hole, usually from deformation of the teflon seal or calcium build up. It can also be the pump or OPV however this usually manifests like OP's condition.

            If the surface of the group that the solenoid attaches to is still smooth with no serious pitting, replacement teflon seals with metal inserts will be fine. If there is damage to the surface, an older silicone gasket will be a better solution.

        • #6
          Needs a new pump, best to replace the OPV at the same time as it can lose accuracy as it ages and the thread of the OPV itself can become brittle from the heat. The pump is connected directly to the inlet of the steam boiler heat exchanger so there is quite a bit of heat applied to the OPV and pump at all times when idling. Sometimes you can see a yellowing/brown discolouration of the OPV and pump outlet, this is a clear indicator of age.

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          • #7
            Originally posted by robertshepherd View Post
            Interesting issue. I'm having a potentially related issue with slow pressure build (when using the blind basket) maxing out at 7bar at 20 seconds. Can't get above 3 bar with grounds. When the pump does get to 7ish bar, I get it bouncing off the OPV - not as extreme as your issue as it doesn't drop back down to zero. Assume it's either the pump or OPV or both?, so have ordered a replacement brass neck pump and brass OPV from coffee parts on eBay and will install next week. Will replace the solenoid gasket at the same time to make sure there aren't any blockages to the water flow - and will slayer mod while I'm in there. Will let you know how it goes.
            Would love a source for these gaskets if you have one. Called Breville and they won't provide anymore, I have to go through an authorised service centre. Can find lots of full solenoids on eBay, but not the gasket itself. Thank you!

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            • #8
              Originally posted by robertshepherd View Post

              Would love a source for these gaskets if you have one. Called Breville and they won't provide anymore, I have to go through an authorised service centre. Can find lots of full solenoids on eBay, but not the gasket itself. Thank you!
              Try OutwestCoffee - they have them listed in the Breville spares section.

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              • #9
                Quick report back on my issue. Replaced pump with brass neck pump and brass OPV and solenoid from OutWest coffee while I was in there. No visible damage to either. No pitting of solenoid surface, so was fine to replace with new teflon seals and new solenoid. Have a backup rubber gasket in case needed in future. Waste dump silicon tube from solenoid is looking very old and stained, with sticky residue from heat and oil damage. Looks like it was pressed up against the steam boiler for a while as there are clear burn marks on the tube and residue on the boiler. Will replace tube after a trip to Bunnings for silicon tube. Otherwise, reassembled and is working absolutely perfectly. Adjusted brass OPV to dump at 10 bar and it's smoothly releasing at that pressure and my coffee now has creama again! Other than a mild shock from stupidly touching the brew heater with my finger while adjusting the OPV, was in and out in under an hour thanks to all the videos and help on this site. For a machine with a poor reputation for serviceability, it was all well laid out and easy to work with. Can't imagine a pump replacement being much easier than this? Next step is learning how to Salyer-shot. Thanks coffee snobs!

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                • #10
                  Mains voltage electric shocks have the potential to knock your heart beat out of rhythm asymptomatically (at first anyway), and can cause significant heat issues (up to and including death) up to 48 hours after the shock. An ECG can determine if your heart rhythm is abnormal or not and should be done as a matter of priority after every electric shock. This is one of the reasons repairs etc to mains voltage appliances should only be done by suitably licenced and qualified people.

                  Even suitably licenced and qualified people unplug the machine before touching the insides.

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