Loadcell Tare Failed #31525 (CORE One) #26525 (MK4S) #13525…

What happened?

The Prusa CORE One, and the Original Prusa MK4/S, MK3.9/S are equipped with a loadcell, which detects whether the nozzle is close enough to the steel sheet for printing and prevents damage from the nozzle digging into the steel sheet.

The loadcell sets itself a reference, called tare. In case there is an issue during this procedure, the printer will show the message: "Setting the tare failed. Check the loadcell wiring and connection."

Error name: Loadcell Tare Failed

Error code: #31525 (CORE One) #26525 (MK4S) #13525 (MK4) #27525 (MK3.9S) #21525 (MK3.9)

How to fix it?

A visual inspection

Before you start, make sure:

the filament is unloaded from the extruder
the printer is turned OFF and unplugged from electricity
the hotend and the heatbed are cooled down to ambient temperature

Access the right side of the LoveBoard, where the loadcell cable is connected. To remove the side LoveBoard cover, on CORE One loosen two M3x6 bolts, on MK4/S and MK3.9/S loosen one M3x10 bolt.

Once accessed, locate the loadcell connector and cable, and check for any loose cable, disconnected cable, or visible damage.

Re-test the loadcell

Do not manipulate or touch the printer unless the instructions on the printer screen prompt you to do so.

Navigate to LCD Menu -> Control -> Calibrations & Tests -> Loadcell Test to initiate a loadcell test.

During the test, you will be asked to tap the nozzle at a specific time, and a progress bar shown on the screen is filled, depending on the pressure applied to the loadcell. If the bar is not filled or is filled irregularly, please contact our customer support.

Tapping of the nozzle can be done with a finger, as well as with a hard object.

Loadcell white pad - visual check

Ensure to have the PG-assembly-adapter before continuing with the following procedure. If you do not have it, you can print it using the below files, depending on the printer you will use:
PG-assembly-adapter printed with MK4/S
PG-assembly-adapter printed with MK3/S/+

If any filament is loaded, unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.
Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece.

The top part of the loadcell is now visible and has a white pad attached to it. Without touching the white pad, check it for damage.

Reassemble the block of PG-case, PG-ring, gearbox, and main plate. In case the parts are not in one block, follow the dedicated steps from the Nextruder assembly manual, depending on your printer version.
Perform the gearbox alignment.

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