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Loadcell Timeout

#31528 (CORE One) #26528 (MK4S) #13528 (MK4) #27528 (MK3.9S) #21528 (MK3.9)

Relevant for

MK4
MK3.9
MK4S
MK3.9S
CORE One
6 comments
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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 printer firmware expects a measurement sample from the loadcell to occur within a specified time. In case this does not happen, the printer will show the message "There was a timeout while waiting for measurement sample, please repeat the action."

Error name: Loadcell Timeout

Error code: #31528 (CORE One) #26528 (MK4S) #13528 (MK4) #27528 (MK3.9S) #21528 (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/+
  1. If any filament is loaded, unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.
  2. Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece. 
  1. 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. 

  1. 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. 
  2. Perform the gearbox alignment
 

3 comments

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MacMarty
Hm, this error pops up first thing when my (kit-built) MK4 boots. I have re-snapped the load cell connector to the love board.Is there anything that I can measure with a VOM, to ensure that the loadcell is not bad?
 
This message appears IMMEDIATELY after the bootloader runs. This is a brand new machine.
Marina Curzi - Official Prusa CS

Please get in touch with our Support to troubleshoot this issue.

dbm0926
Had this error on the MK4 KIt using the given 4.7.2 firmware supplied by the USB. Support thought I had a bad loveboard but it turned out that it was a firmware issue the entire time. I was only able to use the printer once the newer 5.0 firmware was finally released a week later.
TryTryAgain
After kit assembly and firmware update to 4.7.2 on first startup, I got this error after fan self check, just after Z raised.
I hadn't updated WiFi firmware yet because I figured I would set that up later.
But after I inspected connections (good), looked around in the menus (filament sense said disconnected?), loaded/unloaded filament (heat cycle?), then I updated WiFi firmware, then load cell and everything continued fine.
Zach
Same for me, first print after building the kit. I had this error and I updated the Wi-Fi firmware and then it worked fine. I didn't even unload the filament or check anything else. I reran the print and it just worked.
Blue Who
Same solution, updating firmware fixed the issue.