Printer does not turn on or keeps turning off

Updated 1 month ago ​by Tomáš Chvalina

If your MK2 printer doesn't turn on, or it keeps turning off during preheating, the most common causes are either wrong voltage on the PSU or a blown fuse.

The printer turns off during preheating

If your printer happens to power off during the initial preheating process, there's usually no serious damage. Most likely you just have the voltage switch set to 220V a 110V power environment. 

  1. Turn the printer off and remove it from the power source.
  2. Find the AC voltage switch for 110v or 220v on the PSU.

  3. Make sure that the rocker is switched to your local voltage setting.
  4. Try to turn the printer on again. 

If you are still experiencing any issues, please contact us at info@prusa3d.com and our support team will help you out.

The printer does not turn on 

If your printer does not turn on at all, then there might be a more serious problem present. Try the following steps:

  1. Turn the printer off and disconnect the power cord.
  2. Find the AC voltage switch for 110v or 220v on the PSU and make sure that the rocker is switched to your local voltage setting.

  3. Check all the wiring for broken cables. In some cases, overtightening the zip-ties can damage the wire insulation and cause a short.
  4. Check the wiring of your miniRAMBo board at MK2/MK2S miniRAMBo electronics wiring. Make sure that the PSU cables are properly plugged into the miniRAMBo. 
  5. Check if the miniRAMBO fuses are not blown. You can find more information about that in our article Blown Fuse (miniRAMBO).

  6. Check the PSU fuse. 
    1. Find the PSU fuse, which is located just above the PSU's power plug. 
    2. Remove the cover of the PSU fuse, the best tool for that is the screwdriver that comes bundled with our printer 
    3. Inspect if the wire inside of the fuse is intact. If it is damaged, then it must be replaced (fuses can be found at any local car parts or hardware store, T5AL250V 20mm fuses are the original fuses used in the PSU ). When you are replacing the fuse, make sure that the printer is turned off and disconnected from the power source.

If the printer still does not turn on contact us at info@prusa3d.com and our support team will help you out. 


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