Prusa Error 13526: Loadcell Measure Failed
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Prusa error 13526 means the loadcell returned an infinite or undefined load value. On an MK4 or CORE One that sensor is how the printer finds Z, so nothing works until it reads sensibly. Start with the cable: it runs in the extruder loom and flexes every print, and a partial break gives exactly this kind of nonsense reading.
The loadcell is what replaced the probe on these machines. Instead of sensing the bed inductively at an offset, the printer presses the nozzle down and measures force. That is more accurate and more dependent on one thin cable staying intact.
Where to buy
Check in this order
- Reseat the loadcell connector. At both ends. It sits in a crowded bundle and works loose over time.
- Inspect the flex point. Where the extruder loom curves tightest. A partial break produces intermittent undefined readings rather than a clean failure.
- Clean the nozzle and the sheet. A blob or debris skews the force measurement enough to read as impossible — see nozzle cleaning.
- Run the loadcell test. From the Calibrations menu. Do not assume the error clearing means the sensor is healthy.
The three codes that share a cause
13301 is Z homing failing, 13833 is bed levelling failing, and 13526 is the sensor itself returning nonsense. In practice all three are usually the same cable or the same dirty nozzle, which is worth knowing before you order parts for one of them.
After it is fixed
Re-run first-layer calibration. The loadcell defines where Z zero is, so any work on it changes the squish — see setting the offset.
This error reads 31526 on CORE One, 35526 on CORE One L and 17526 on XL.
Prusa Error 13526 FAQ
Is the loadcell expensive to replace?
It is a service part, but check the cable and connector first — those account for most cases and cost nothing to rule out.
Why does it fail only sometimes?
An intermittent fault means a partial break in a cable that flexes, not a dead sensor. Flexing the loom while watching the reading will find it.
Can a dirty nozzle cause 13526?
Yes. The measurement is taken through the nozzle tip, so a blob distorts the force curve enough to produce an undefined value.
Do I need to recalibrate after fixing it?
Yes. Run the loadcell test, then first-layer calibration, because Z zero is derived from this sensor.
LayerWalker
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