heatbed not working So I've been trying to find the answer to this for days and I'm lost. I cannot get my heat bed to turn on. My hot end, fan and all other hardware are working perfectly. I am using Marlin and have attached my configuration file. The most obvious answers are my motherboard is type 33 or BOARD_RAMPS_13_EFB. I also have my temp_sensorbed set to type 1. My hot end gives a temp and will turn on. The heatbed give a temp of 0 (like it's disabled) and won't turn on. I also don't get any errors. I can do a print just without a hotbed. To force pins I put this at the end of my pins.h file: #define HEATER_0_PIN 10 // Extruder #define HEATER_1_PIN -1 #define HEATER_2_PIN -1 #define HEATER_BED_PIN 8 // Bed #define FAN_PIN 9 // Fan #define TEMP_0_PIN 13 //D27 // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!! #define TEMP_1_PIN -1 // 1 #define TEMP_2_PIN -1 // 2 #define TEMP_BED_PIN 15 // 1,2 or I2C #define SENSITIVE_PINS... Now I thought well there's no real firmware difference between the heatbed and hotend so without any hardware changes I swapped the temp and pin assignments for the hotend and the heatbed.Magically the heatbed works perfectly and the hotend says 0 degrees and won't turn on. That makes me believe it has to be firmware but can't figure it out. Any ideas? Thanks, konkop https://reprap.org/forum/read.php?4,555208,555208#msg-555208 Tue, 14 Jul 2026 12:20:52 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,555208,556349#msg-556349 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,556349#msg-556349 imqqmi Reprappers Thu, 10 Sep 2015 01:06:50 -0400 https://reprap.org/forum/read.php?4,555208,556339#msg-556339 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,556339#msg-556339 AquaticsLive Reprappers Wed, 09 Sep 2015 23:31:52 -0400 https://reprap.org/forum/read.php?4,555208,556334#msg-556334 Re: heatbed not working - SOLVED!! https://reprap.org/forum/read.php?4,555208,556334#msg-556334 https://github.com/MarlinFirmware/Marlin/tree/Release/Marlin And I couldn't find a pins_Ramps_13.h. But either way I went back in and downloaded the latest firmware again. Changed the board type to BOARD_RAMPS_13_EFB. Changed the E1 and Bed sensors to 1. hooked everything up per imqqmi's suggestion and it WORKED!!! Comparing the two files side by side I found the problem. It was the temp bed pin assignment.

Solution:
I had inadvertently deleted the underscore from the following line:
"#define TEMP_SENSOR_BED 1" so it looked like "#define TEMP_SENSORBED 1".

Sorry guys I should have tried re-downloading the firmware it before.]]> konkop Reprappers Wed, 09 Sep 2015 22:38:30 -0400 https://reprap.org/forum/read.php?4,555208,556293#msg-556293 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,556293#msg-556293
Then to verify they are plugged in to correct locations you can remove one and see if the value goes to 0 in the software it generates an error and you will have to reset it to get it working again, but seems to be a fool proof way to know if you have them swapped.


I looked at the files you uploaded not sure what version of Marlin you are using, you have your board set to 33 which is the old Marlin naming, but then the there is the newer style naming convention commented out right next to it.

#ifndef MOTHERBOARD
//#define MOTHERBOARD BOARD_RAMPS_13_EEB
//#define MOTHERBOARD BOARD_RAMPS_13_EFB
#define MOTHERBOARD 33
#endif

If you are using the newer Marlin firmware the file that controls the pins is the one specifc to the board your using like "pins_RAMPS_13.h" for the RAMPS boards.]]> AquaticsLive Reprappers Wed, 09 Sep 2015 18:38:50 -0400 https://reprap.org/forum/read.php?4,555208,556194#msg-556194 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,556194#msg-556194
I'm not sure how the compiler handles #defines that has already been defined. If you want to play it safe, you can first #undef the define and then make your #define to replace it.

The second thermistor connector is assigned to the bed according to this schematic. Frankly I forgot where I connected mine ;)

]]> imqqmi Reprappers Wed, 09 Sep 2015 14:42:08 -0400 https://reprap.org/forum/read.php?4,555208,555990#msg-555990 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555990#msg-555990 konkop Reprappers Wed, 09 Sep 2015 08:34:53 -0400 https://reprap.org/forum/read.php?4,555208,555882#msg-555882 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555882#msg-555882 imqqmi Reprappers Wed, 09 Sep 2015 04:00:06 -0400 https://reprap.org/forum/read.php?4,555208,555819#msg-555819 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555819#msg-555819 konkop Reprappers Tue, 08 Sep 2015 23:55:38 -0400 https://reprap.org/forum/read.php?4,555208,555796#msg-555796 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555796#msg-555796
It's only sensible to power a heater if it is being monitored by a sensor. You risk a fire if you don't.

You can assign the hot end temp sensor as the heated bed sensor, but again you're only fooling the firmware and you'll not get a properly working 3d printer. Get a thermistor for the heated bed and it should complete the heated bed build.]]> imqqmi Reprappers Tue, 08 Sep 2015 18:36:28 -0400 https://reprap.org/forum/read.php?4,555208,555771#msg-555771 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555771#msg-555771 konkop Reprappers Tue, 08 Sep 2015 16:52:46 -0400 https://reprap.org/forum/read.php?4,555208,555728#msg-555728 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555728#msg-555728
Make sure you check them at plug end to make sure there isn't a bad connection someplace between the board and the sensor.]]> AquaticsLive Reprappers Tue, 08 Sep 2015 14:52:46 -0400 https://reprap.org/forum/read.php?4,555208,555717#msg-555717 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555717#msg-555717 konkop Reprappers Tue, 08 Sep 2015 14:36:22 -0400 https://reprap.org/forum/read.php?4,555208,555411#msg-555411 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555411#msg-555411 imqqmi Reprappers Tue, 08 Sep 2015 04:14:03 -0400 https://reprap.org/forum/read.php?4,555208,555292#msg-555292 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555292#msg-555292 konkop Reprappers Mon, 07 Sep 2015 18:39:28 -0400 https://reprap.org/forum/read.php?4,555208,555285#msg-555285 Re: heatbed not working https://reprap.org/forum/read.php?4,555208,555285#msg-555285
Also make sure you've got power on the 11Amps input. You can connect a fan on the heater output to check if it's working. If so the heated bed may be faulty or not wired correctly.

ramps schematic

Uarduino mega 2560 schematic]]> imqqmi Reprappers Mon, 07 Sep 2015 18:18:58 -0400 https://reprap.org/forum/read.php?4,555208,555208#msg-555208 heatbed not working https://reprap.org/forum/read.php?4,555208,555208#msg-555208
#define HEATER_0_PIN 10 // Extruder
#define HEATER_1_PIN -1
#define HEATER_2_PIN -1
#define HEATER_BED_PIN 8 // Bed
#define FAN_PIN 9 // Fan

#define TEMP_0_PIN 13 //D27 // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
#define TEMP_1_PIN -1 // 1
#define TEMP_2_PIN -1 // 2
#define TEMP_BED_PIN 15 // 1,2 or I2C

#define SENSITIVE_PINS...

Now I thought well there's no real firmware difference between the heatbed and hotend so without any hardware changes I swapped the temp and pin assignments for the hotend and the heatbed.Magically the heatbed works perfectly and the hotend says 0 degrees and won't turn on. That makes me believe it has to be firmware but can't figure it out. Any ideas?

Thanks, konkop]]> konkop Reprappers Mon, 07 Sep 2015 15:06:30 -0400