Heated Bed Stuck at 69c

Heated Bed Stuck at 69c Hi All, My temp sensor for my bed fell off and when I went to reconnect it on of the wires touched the wires that actually heat the bed (my fault for not turning the system off obviously). Anyway everything still works (bed heats up, sensor works [verified by testing in extruder's port] etc.) except that now the bed temp is stuck at 69c, however the bed is cool to the touch, and when I turn the bed on the number does not change, but the bed heats up. Im assuming that the port I was using is now fried, but Im hoping I can avoid buying a new board right now by hooking up the sensor to the slot for the second extruder (which is not in use). I have tried sifting through marlin but cannot find which pins I need to alter, or what to change them to. For reference my Printer is the GeeeTech Prusa I3X. Ive linked a picture of the board, and if any other info would help id be happy to provide it. Board Thanks! https://reprap.org/forum/read.php?1,717254,717254#msg-717254 Thu, 12 Mar 2026 15:19:52 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,717254,717289#msg-717289 Re: Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717289#msg-717289

Quote
DragonFire
It's probably in pins.h somewhere... which pins the geetech uses. Probably commented.

EDIT: No it isn't... you are going to have to check which board is defined in boards.h, then look through pins.h.

When you find the right entry for the board you have selected in boards.h, swap the TEMP_BED_PIN value for the TEMP_1_PIN value, to swap the inputs over.

Save, recompile, should fix it.

I tried the Geetech website, it doesn't seem to be working. If indeed it ever does... never tried it before.

Thanks! That fixed the issue! I didnt realize there were different sections for different boards, makes total sense though.]]> chunkeyolover59 General Tue, 25 Oct 2016 19:08:09 -0400 https://reprap.org/forum/read.php?1,717254,717286#msg-717286 Re: Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717286#msg-717286 chunkeyolover59 General Tue, 25 Oct 2016 18:39:59 -0400 https://reprap.org/forum/read.php?1,717254,717282#msg-717282 Re: Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717282#msg-717282
Find TEMP_BED_PIN, Replace with TEMPCHUNKEYLOVER (all of them)

Find TEMP_1_PIN, replace withe TEMP_BED_PIN (all of them)

Find TEMPCHUNKEYLOVER, replace with TEMP_1_PIN (all of them)

That should do it. Save and recompile.]]> DragonFire General Tue, 25 Oct 2016 18:34:05 -0400 https://reprap.org/forum/read.php?1,717254,717277#msg-717277 Re: Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717277#msg-717277
Sorry, I'm not helping you much here, but I think you got the right idea - just got to find the right pair to swap over.

I guess you could swap them all over. Kind of a shotgun strategy.]]> DragonFire General Tue, 25 Oct 2016 18:18:15 -0400 https://reprap.org/forum/read.php?1,717254,717275#msg-717275 Re: Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717275#msg-717275 chunkeyolover59 General Tue, 25 Oct 2016 18:05:31 -0400 https://reprap.org/forum/read.php?1,717254,717272#msg-717272 Re: Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717272#msg-717272
EDIT: No it isn't... you are going to have to check which board is defined in boards.h, then look through pins.h.

When you find the right entry for the board you have selected in boards.h, swap the TEMP_BED_PIN value for the TEMP_1_PIN value, to swap the inputs over.

Save, recompile, should fix it.

I tried the Geetech website, it doesn't seem to be working. If indeed it ever does... never tried it before.]]> DragonFire General Tue, 25 Oct 2016 18:01:37 -0400 https://reprap.org/forum/read.php?1,717254,717270#msg-717270 Re: Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717270#msg-717270
The snag with continuing with it is that, if it's always going to read at 69, that might stop it printing at all...

Probably hackable, but I don't know of any 3D printers that have 2 hotbeds. It's going to cause issues if you try to fool the system...

... on the other hand, it's probably just swapping the pin assignments inside Marlin, so that a different pin is read. Can't help you with which one, I don't know the Geetech board...]]> DragonFire General Tue, 25 Oct 2016 17:58:37 -0400 https://reprap.org/forum/read.php?1,717254,717261#msg-717261 Re: Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717261#msg-717261 chunkeyolover59 General Tue, 25 Oct 2016 17:40:59 -0400 https://reprap.org/forum/read.php?1,717254,717256#msg-717256 Re: Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717256#msg-717256
Here's how you test - swap the sensor inputs for the hotend and hotbed. If the hotend is now showing 69C, then the board is fine, and it's just the sensor/wires that are damaged.

Don't forget to swap them back again. :)

Most likely you will need a new thermistor, but it could just be the sensor wire accidently connected to a metal frame or something like that. (Short circuit, the tiny electrical signal isn't going where it should be going).]]> DragonFire General Tue, 25 Oct 2016 17:15:14 -0400 https://reprap.org/forum/read.php?1,717254,717254#msg-717254 Heated Bed Stuck at 69c https://reprap.org/forum/read.php?1,717254,717254#msg-717254
My temp sensor for my bed fell off and when I went to reconnect it on of the wires touched the wires that actually heat the bed (my fault for not turning the system off obviously). Anyway everything still works (bed heats up, sensor works [verified by testing in extruder's port] etc.) except that now the bed temp is stuck at 69c, however the bed is cool to the touch, and when I turn the bed on the number does not change, but the bed heats up.

Im assuming that the port I was using is now fried, but Im hoping I can avoid buying a new board right now by hooking up the sensor to the slot for the second extruder (which is not in use). I have tried sifting through marlin but cannot find which pins I need to alter, or what to change them to.

For reference my Printer is the GeeeTech Prusa I3X. Ive linked a picture of the board, and if any other info would help id be happy to provide it.

Board

Thanks!]]> chunkeyolover59 General Tue, 25 Oct 2016 17:09:34 -0400