I cleaned the grinder and apparently changed reality

[Probability Paper]

Machine / revision: Profitec GO 2025
Country / voltage: Canada / 120V
Grinder / burrs / setting / calibration: DF64 Gen 2; stock 64 mm flat burrs; 11 on my collar; chirp point marked with tape.
Basket / portafilter: 18 g IMS precision basket; bottomless portafilter (58 mm system where applicable).
Bean / roast date: Guatemala Huehuetenango medium roast; roast date 2026-07-28.
Dose / yield / extraction time: 17.5 g in, 35 g out, 27 s target/current reference.
Water / temperature: RO water remineralized to about 70 ppm TDS; 94°C.
Exact symptom: After a burr swap, chirp/contact starts on one side before full even contact.
Tests already performed: Clean mating surfaces, rotate/seat burrs correctly and use a marker test before grinding Already cleaned the obvious removable parts and repeated the test once.
Diagnostic photograph or video: close-up of the basket/puck plus a short flow video.

The DF64 Gen 2 is doing something it did not do last week. I would like to diagnose the boring mechanical cause before I invent a burr-alignment religion around it.

[Probability Paper]

Confirmed solution: I reseated the burr carrier, cleaned the mating surfaces, found true burr touch again and recalibrated from there. The old number was simply no longer the same reference. I am leaving the original numbers above intact so the next person can see what changed.

[Bookish92]

Not the exact revision, but I had a closely related setup with the same general failure mode. The thing that saved time was separating the DF64 Gen 2 / puck-prep side from the machine side instead of adjusting both together. Similar experience, not proof for your unit.

[Pipe And Punch]

I would mark the part you changed and photograph the original position before going farther. Future you is an unreliable witness.

[Fermenter]

Counterpoint: I would not order parts yet. The symptom still overlaps with a calibration/setup problem, and a new part can make the evidence worse.

[Mending Dumpling]

Short answer: Start with the simple reproducible test before buying parts.
Applies to which model/revision: Profitec GO 2025.
Likely cause: The symptom points first to a setup, wear-part or calibration issue that can be separated from a major failure.
Test to perform next: Return one variable to a known reference, repeat twice, and record whether the symptom changes in the same direction.
Expected result: If that subsystem is the cause, the symptom should change predictably rather than randomly.
Safety limit: Unplug before opening the burr chamber. Do not defeat interlocks or force a stalled motor.
Evidence: First-hand owner experience with the same model/configuration; not a manufacturer diagnosis.

[Wire And Gloves]

The useful documented check is the revision-specific maintenance/service sequence, not a generic espresso-machine video. For Profitec GO 2025, verify the manual procedure and part number before opening or ordering anything. If the documented test does not reproduce the fault, stop treating that subsystem as proven.

[Motorcity74]

Inference only: because the symptom is repeatable and your listed tests already rule out some obvious causes, I would suspect the narrowest remaining mechanical/setup path before a board-level failure. I would not buy a part from that inference alone.

[Phish-Fiction]

This is a good example of why the exact revision and test history matter. “My Profitec GO 2025 is bad” produces twenty theories; the measurements above at least give the theories somewhere to die.

[Fermenter]

I vote we rename channeling “espresso weather” and move on.

[Raga Bridges]

I would mark the part you changed and photograph the original position before going farther. Future you is an unreliable witness.

[Bookish92]

This is where a cheap measurement beats another theory. Record the same test twice before and twice after the change.

[Phish-Fiction]

Counterpoint: I would not order parts yet. The symptom still overlaps with a calibration/setup problem, and a new part can make the evidence worse.

[Author]

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