Unable to verify Extruder Type - Hardware, firmware and software help https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk3-9s-hardware-firmware-and-software-help/unable-to-verify-extruder-type/ Prusa3D Forum Discussion Board en-US Wed, 10 Jun 2026 06:50:49 +0000 wpForo 60 RE: Unable to verify Extruder Type https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk3-9s-hardware-firmware-and-software-help/unable-to-verify-extruder-type/#post-786340 Thu, 19 Mar 2026 09:14:54 +0000 sounds like you did the steps here. 


https://help.prusa3d.com/article/extruder-not-detected-31615-core-one-35615-core-one-l-26615-mk4s-13615-mk4-27615-mk3-9s-21615-mk3-9-28615-mk3-5s-23615-mk3-5_813941

Did you reach out to support so they can assist you further to identify the problem? Might be a good option for you. 

]]> Hardware, firmware and software help Same Old Shane https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk3-9s-hardware-firmware-and-software-help/unable-to-verify-extruder-type/#post-786340 Unable to verify Extruder Type https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk3-9s-hardware-firmware-and-software-help/unable-to-verify-extruder-type/#post-786326 Thu, 19 Mar 2026 03:09:54 +0000 Just completed the upgrade of my MK3.9 to a MK3.9S (originally a 2018 MK3). 6.4.0 firmware.

Fired it up and to my dismay got an Error# 23615 "Unable to verify Extruder Type, check connections”.

Checked connections to no avail. Would there be a problem with the love board? Looking for any further trouble shooting advice.

]]> Hardware, firmware and software help Ted Lawson https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk3-9s-hardware-firmware-and-software-help/unable-to-verify-extruder-type/#post-786326