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Thread: Brew pressure gauge problem on VBM 2B

  1. #1
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    Brew pressure gauge problem on VBM 2B

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi,

    Just wanted to know if anyone could help with a problem with my VBM 2B which has been serving me faithfully for a number of years.

    The machine has been great, but recently there has been a problem with the brew pressure gauge. When the machine is cold it reads 4 bar, when it is heated up it goes up to 10 and then during a shot it goes to around 9-10 bar. After the shopt finishes, the number on the gauge shoots up to the maximum (16 bar). If I pull the lever up without the portafilter it fluctuates around the 8-10 bar range.

    If anyone has any idea on what could be causing the problem that would be fantastic.


    Thanks,
    Tim

  2. #2
    Senior Member robusto's Avatar
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    Hi Tim,
    Is the machine plumbed into the water mains or drawing from a tank?

  3. #3
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    Hi robusto,

    Thanks for the reply.... much appreciated.

    Since the machine is located in a part of the kitchen without plumbing it is 'plumbed' in via a Flojet system to a bottle containing filtered water. I've got a splitter on the Flojet that connects the water to the coffee machine as well as a water filter tap. I have not noticed any change in the water pressure when using either the tap or when I pull the lever up on the machine so I wouldn't think that would be the problem. I've had the same setup with no changes running for around 5 years or so.

    Hopefully that clarifies things a bit.... but if you need a more detailed explanation please let me know.
    Last edited by Javaphile; 22nd November 2019 at 02:08 AM. Reason: Commercial link removed

  4. #4
    Senior Member robusto's Avatar
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    A strange one.
    And I don't have the answers.
    My thoughts are that when heating water in the brew lines expands and causes pressure to rise from the idle 4 bar when cold.
    Why if would then shoot to 16 bar after pulling a shot? Don't know. Maybe the flowjet pump pressure?
    These problems are all of a sudden without any changes having been made? Twelve years ago my rotary pump would draw from a tank. Now, the same pump
    needs an inline anti flowback valve (which like your system, is playing havoc with pressures).

  5. #5
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    No worries.... I'm just as stumped as you are.

    Thanks anyway.... might just need to book the machine in for a service. You wouldn't happen to have any recommendations for a place in Melbourne would you?

  6. #6
    Senior Member CafeLotta's Avatar
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    Site Sponsor The Coffee Machinist would be worth getting in touch with.
    Dimal likes this.

  7. #7
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    Thanks CafeLotta. I may give him a call next week some time.

  8. #8
    Senior Member Jackster's Avatar
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    I'd say it has some chunk of scale upsetting things
    Dimal likes this.



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