Hotend not Heating Up Hi all, i have a Mendelmax on Ramps 1.4 which just worked fine. After a short at the hotend connector i have the following problem: Hotend is not heating up anymore, Thermistor seems to be fine and returns temperature. Bed is heating up fine. Ramps is taking the desired temp for the hotend with no complaints just not powering the hotend (checked voltage). Fuses seem to be ok as well. Problem remains if hotend is detached (thermistor still on), even with a new thermistor. Any ideas? Thanks in advance, Stephan https://reprap.org/forum/read.php?4,317077,317077#msg-317077 Mon, 05 Oct 2026 20:28:34 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,317077,318281#msg-318281 Re: Hotend not Heating Up https://reprap.org/forum/read.php?4,317077,318281#msg-318281 Janski Reprappers Sat, 01 Mar 2014 21:19:12 -0500 https://reprap.org/forum/read.php?4,317077,317399#msg-317399 Re: Hotend not Heating Up https://reprap.org/forum/read.php?4,317077,317399#msg-317399

]]> snoller Reprappers Fri, 28 Feb 2014 05:42:06 -0500 https://reprap.org/forum/read.php?4,317077,317333#msg-317333 Re: Hotend not Heating Up https://reprap.org/forum/read.php?4,317077,317333#msg-317333 snoller Reprappers Fri, 28 Feb 2014 03:04:26 -0500 https://reprap.org/forum/read.php?4,317077,317136#msg-317136 Re: Hotend not Heating Up https://reprap.org/forum/read.php?4,317077,317136#msg-317136
Quote
snoller
After a short at the hotend connector i have the following problem:

What shorted? If the leads to the hot end got shorted together, you may have damaged the MOSFET that provides power to the hot end.]]> NewPerfection Reprappers Thu, 27 Feb 2014 16:23:44 -0500 https://reprap.org/forum/read.php?4,317077,317107#msg-317107 Re: Hotend not Heating Up https://reprap.org/forum/read.php?4,317077,317107#msg-317107 www.reprapdiscount.com]) and the behavior with that one remains the same.]]> snoller Reprappers Thu, 27 Feb 2014 15:00:36 -0500 https://reprap.org/forum/read.php?4,317077,317084#msg-317084 Re: Hotend not Heating Up https://reprap.org/forum/read.php?4,317077,317084#msg-317084
It could be the faulty resistor as I have read that if the resistor heats up too much it may become faulty. Please correct if I am wrong in thinking this.

Sincerely,

Janski]]> Janski Reprappers Thu, 27 Feb 2014 14:21:13 -0500 https://reprap.org/forum/read.php?4,317077,317077#msg-317077 Hotend not Heating Up https://reprap.org/forum/read.php?4,317077,317077#msg-317077 i have a Mendelmax on Ramps 1.4 which just worked fine. After a short at the hotend connector i have the following problem:
Hotend is not heating up anymore, Thermistor seems to be fine and returns temperature. Bed is heating up fine. Ramps is taking the desired temp for the hotend with no complaints just not powering the hotend (checked voltage). Fuses seem to be ok as well. Problem remains if hotend is detached (thermistor still on), even with a new thermistor.
Any ideas?
Thanks in advance,
Stephan]]> snoller Reprappers Thu, 27 Feb 2014 14:08:51 -0500