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Thread: NS Oscar I - Not backflushing properly

  1. #1
    Junior Member
    Join Date
    Jul 2018
    Posts
    22

    Unhappy NS Oscar I - Not backflushing properly

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hey guys

    Bought this NS Oscar I used a while ago and it just occurred to me recently that what I've been experiencing is not normal. I've listed some observations below:


    1. After pulling a shot and taking the PF out, there's a thing layer of water at the top, sometimes it's not there, most times it is. Puck is not dry at all
    2. When I begin extraction and then stop it, the machine almost always gives a delayed backflush noise (maybe about a second before I hear it) and it's also very lackluster. When I put it through a cleaning procedure, sometimes there is only a little dribble coming out into the drip tray
    3. When I have a blind filter on, sometimes the backflushing is delayed or simply doesn't occur. In the latter case I need to actually unlock the PF slightly and then it backflushes


    My gut feel is that my 3-way solenoid valve is either blocked or completely faulty. Has anyone experienced something similar and know what steps I should do to troubleshoot and fix it?

    P.S. I have little to no experience opening up machines, photos or some guides I can reference would be super helpful

  2. #2
    Junior Member
    Join Date
    Jun 2019
    Location
    Mount barker s.a.
    Posts
    12
    These machines are very easy to pull apart, just 6 screws in the top and hi all comes off. https://www.elektros.it/it/en/tips_t...tml#paragrafo8

    I've used the guides in the link to pull apart and check all the fitting attached to the group head including the 3way solenoid. If you get stuck I may be able to help.



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