heated bed Test not passed - Hardware, firmware and software help https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-hardware-firmware-and-software-help/heated-bed-test-not-passed/ Prusa3D Forum Discussion Board en-US Sat, 13 Jun 2026 00:20:38 +0000 wpForo 60 RE: heated bed Test not passed https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-hardware-firmware-and-software-help/heated-bed-test-not-passed/#post-778248 Thu, 15 Jan 2026 14:10:33 +0000 Try reverting to firmware 6.2.6.  The latest firmware (6.4.0) has a ton of bugs, although some people have been able to make it work by doing a complete factory reset and recalibrating everything.

]]> Hardware, firmware and software help LarGriff https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-hardware-firmware-and-software-help/heated-bed-test-not-passed/#post-778248 heated bed Test not passed https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-hardware-firmware-and-software-help/heated-bed-test-not-passed/#post-778079 Wed, 14 Jan 2026 12:47:57 +0000 When I try to run the heated bed test, it fails. It won't go above 65°C. My software version is 6.4.0.

It's strange. There doesn't seem to be a thermistor error, because when I manually adjust the bed temperature above 65°C, up to 110°C, it works perfectly.

The printer prints fine, but the message to run the tests always appears before printing begins.

]]> Hardware, firmware and software help Jordi Vela https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-hardware-firmware-and-software-help/heated-bed-test-not-passed/#post-778079