What Does This Error Mean?

PINDA calibration failure is usually caused by the PINDA probe mounted too high above the nozzle tip, the probe triggering on the bed screws instead of the PEI surface, or the first layer Z value needing adjustment after a PINDA height change. Adjust PINDA height so the probe tip is 1 mm above the nozzle tip.

Affected Models

Prusa MK3S+
Prusa MK3.9
Prusa MK4 (with SuperPINDA)

Common Causes

PINDA probe mounted too high — trigger height does not correspond to nozzle position
PINDA triggering on the bed screw or bed clip rather than the PEI sheet surface
SuperPINDA affected by temperature — inductive sensors shift calibration as they warm up
Live Adjust Z not re-set after adjusting PINDA height
PINDA cable damaged or loose at the extruder connector

How to Fix It

Adjust PINDA height to 1 mm above the nozzle tip.

Loosen the PINDA mounting screw and lower the probe so the bottom of the probe body is approximately 1 mm above the nozzle tip. Use a 1 mm feeler gauge or a folded piece of paper as a spacer. Retighten the screw firmly and re-run the first layer calibration.
Ensure the PINDA probes the PEI sheet, not a bed screw.

The PINDA calibration routine probes a specific point near the front-left of the bed. Check that this point does not land on or near a bed adjustment screw or clip. If it does, adjust the XY probe position in firmware or slightly reposition the bed clip.
Allow the SuperPINDA to warm up before calibrating.

The SuperPINDA probe is temperature-compensated but still needs to reach operating temperature. Before running a first layer calibration, preheat the hotend to 190°C and wait 5 minutes. Calibrating a cold SuperPINDA gives a different result than calibrating at print temperature.
Re-run the first layer calibration wizard.

After any PINDA height adjustment, always re-run the first layer calibration. Go to LCD > Calibration > First Layer Calibration and print the test rectangle. Adjust Live Adjust Z until the first layer squishes evenly into the PEI surface.
Check the PINDA cable connection.

Inspect the PINDA cable at the extruder cable bundle and at the EINSY/xBuddy board connector. A loose or damaged connector causes intermittent false triggers during the calibration sequence. Gently tug each wire at the connector — a broken wire will pull out of its pin.

When to Call a Professional

If the PINDA or SuperPINDA produces an error during calibration regardless of position adjustments, the sensor itself may have failed. Replacement PINDA and SuperPINDA probes are available from Prusa Research.