Prusa 3D Printer Error Code 5: How to Fix It

Medium 30-90 minutes Medium Severity Verified June 2026
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Error Code
5
Brand
Prusa
Product Type
3d_printer
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-90 minutes
Prusa Error Code 5 occurs when one of the printer's endstop switches is triggered at an unexpected point during a print job. Endstops are small sensors that tell the printer where its axes are — if one trips mid-print, the printer halts to prevent crashing the print head or damaging the hardware. This is a medium-severity issue that is usually caused by a loose wire, a faulty endstop switch, mechanical obstruction, or electrical interference, and can typically be resolved at home with basic tools.
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Tools You'll Need

How to Fix Error Code 5

  1. Power Off and Inspect for Physical Obstructions

    Always unplug the printer before reaching inside the frame or touching any internal components to avoid electric shock or injury from moving parts.

  2. Identify Which Endstop Triggered

  3. Check and Reseat Endstop Wiring

    Do not yank on wires. Grip connectors firmly at the plastic housing — not the wire — when removing and reinserting them.

  4. Test the Endstop Switch Manually

  5. Check Endstop Switch Alignment and Mounting

  6. Inspect for Electrical Interference

  7. Replace the Faulty Endstop Switch

    Use a switch that matches the original specification for your printer model. Consult the official Prusa documentation or community resources to confirm the correct switch type before ordering.

  8. Update Printer Firmware

    Only download firmware from the official Prusa website to avoid installing corrupted or incompatible files.

  9. Run the Printer's Built-In Self-Test

Parts You May Need

Endstop limit switch
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Endstop cable assembly
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Zip ties / cable management clips
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Endstop limit switch
Check Price on Amazon
Endstop cable assembly
Check Price on Amazon
Zip ties / cable management clips
Check Price on Amazon
Endstop limit switch
Check Price on Amazon
Endstop cable assembly
Check Price on Amazon
Zip ties / cable management clips
Check Price on Amazon
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When to Call a Professional

If you have replaced the endstop switch, verified all wiring, updated firmware, and the error persists, the issue may lie with the main control board (EINSY RAMBo or xBuddy). Board-level diagnostics and repair require advanced electronics skills. Contact Prusa Support directly at help.prusa3d.com — their technical team can walk you through advanced diagnostics or arrange a warranty repair if your printer is still under coverage. Do not attempt to reflow solder or replace board components unless you have professional electronics repair experience.

Frequently Asked Questions

What does Prusa Error Code 5 mean?
Prusa Error Code 5 means one of the printer's endstop switches was triggered at an unexpected location during a print. Endstops are limit switches that tell the printer where each axis begins. If one trips in the middle of a move, the printer stops to avoid a mechanical crash or print failure.
Can I continue printing after Error Code 5 appears?
No — you should not attempt to resume printing until the cause of the error is found and fixed. Continuing could cause the print head to crash into the frame, damage the endstop, strip belts, or harm the main control board. Diagnose the issue first.
How do I know which endstop is causing the problem?
On most Prusa printers (MK3/MK3S/MK4), go to Support > Sensor Info on the LCD screen. This shows the live state of all endstops (X, Y, Z). An endstop that reads 'triggered' when the axis is not at its home position is the one causing Error Code 5.
How much does a replacement endstop switch cost?
Endstop switches for Prusa printers are inexpensive, typically costing between $1 and $5 for a generic replacement switch or $5 to $15 for an official Prusa spare part. You can purchase them from the Prusa e-shop, Amazon, or electronics component suppliers.
Can a loose belt cause Prusa Error Code 5?
Indirectly, yes. A very loose or skipping belt can allow an axis carriage to move farther than expected and physically press an endstop switch at the wrong position. If you have ruled out wiring and switch faults, check that your X and Y belts are properly tensioned — Prusa recommends a specific belt tension value that you can check through the printer's LCD menu under Belt Status.

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