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NS Oscar I - Not backflushing properly

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  • NS Oscar I - Not backflushing properly

    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
    These machines are very easy to pull apart, just 6 screws in the top and hi all comes off.

    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.