I need one stupid part, not three wrong ones

[Masala Soil]

Machine / revision: Lelit Mara X V2 2024
Country / voltage: Ireland / 230V
Grinder / burrs / setting / calibration: DF64 Gen 2; stock 64 mm flat burrs; 11 on my collar; chirp point marked with tape.
Basket / portafilter: stock double basket with paper filter; stock spouted portafilter (58 mm system where applicable).
Bean / roast date: Guatemala Huehuetenango medium roast; roast date 2026-08-13.
Dose / yield / extraction time: 18.0 g in, 40 g out, 31 s target/current reference.
Water / temperature: bottled low-mineral water, about 55 ppm TDS; 93°C.
Exact symptom: Coffee tastes metallic/chemical immediately after detergent backflush.
Tests already performed: Run repeated water-only rinse cycles and taste/smell plain hot water before coffee Already cleaned the obvious removable parts and repeated the test once.
Diagnostic photograph or video: photo of the grinder setting and a short shot video.

I bought the Lelit Mara X V2 2024 to make coffee and have somehow acquired a side hobby in water chemistry and tiny rubber parts. I am trying to choose the least destructive maintenance path.

[Masala Soil]

Confirmed solution: I checked the exact revision and water/part specification, followed the manufacturer-compatible procedure, then flushed and verified normal taste/operation before changing anything else. I am leaving the original numbers above intact so the next person can see what changed.

[Typecase1984]

Short answer: Start with the simple reproducible test before buying parts.
Applies to which model/revision: Lelit Mara X V2 2024.
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: Do not exceed the machine/part manufacturer chemical concentration or improvise acids/solvents around seals and boilers.
Evidence: First-hand owner experience with the same model/configuration; not a manufacturer diagnosis.

[Peter Masala]

The useful documented check is the revision-specific maintenance/service sequence, not a generic espresso-machine video. For Lelit Mara X V2 2024, 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.

[Civic Fish Stories]

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.

[Quiet-Editor]

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.

[Masala Soil]

This is a good example of why the exact revision and test history matter. “My Lelit Mara X V2 2024 is bad” produces twenty theories; the measurements above at least give the theories somewhere to die.

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