Ramps 1.4 Hot-End power always on Has anyone had the problem of hot-end power fet staying on all the time? I already replaced the fet to see if it was broken and replaced the heater element to the hotend. Still not working... There's only one resistor between the gate of the fet and the arduino output and I was wondering if the broken fet could have also damaged the arduino board? I'll measure the whole RAMPS soon but I was just wondering if you guys have had similar issue before? https://reprap.org/forum/read.php?219,209097,209097#msg-209097 Tue, 08 Sep 2026 17:57:38 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,209097,209689#msg-209689 Re: Ramps 1.4 Hot-End power always on https://reprap.org/forum/read.php?219,209097,209689#msg-209689
Try changing the MOSFET, I once had similar problem and it disappeared when STP55NF06 MOSFETs were changed.

Hope this will solve you problem.]]> andromedabots RAMPS Electronics Fri, 17 May 2013 20:11:30 -0400 https://reprap.org/forum/read.php?219,209097,209185#msg-209185 Re: Ramps 1.4 Hot-End power always on https://reprap.org/forum/read.php?219,209097,209185#msg-209185
Perhaps something is shorted out, keeping power to it all the time?

Trying using D9 instead of D10?]]> ShadowRam RAMPS Electronics Thu, 16 May 2013 10:18:03 -0400 https://reprap.org/forum/read.php?219,209097,209151#msg-209151 Re: Ramps 1.4 Hot-End power always on https://reprap.org/forum/read.php?219,209097,209151#msg-209151 Big 15 RAMPS Electronics Thu, 16 May 2013 07:51:56 -0400 https://reprap.org/forum/read.php?219,209097,209139#msg-209139 Re: Ramps 1.4 Hot-End power always on https://reprap.org/forum/read.php?219,209097,209139#msg-209139 waitaki RAMPS Electronics Thu, 16 May 2013 05:23:55 -0400 https://reprap.org/forum/read.php?219,209097,209097#msg-209097 Ramps 1.4 Hot-End power always on https://reprap.org/forum/read.php?219,209097,209097#msg-209097 I already replaced the fet to see if it was broken and replaced the heater element to the hotend. Still not working...
There's only one resistor between the gate of the fet and the arduino output and I was wondering if the broken fet could have also damaged the arduino board?
I'll measure the whole RAMPS soon but I was just wondering if you guys have had similar issue before?]]> Big 15 RAMPS Electronics Thu, 16 May 2013 01:56:53 -0400