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Thermistor Problem

Posted by Noxaj113 
Thermistor Problem
April 14, 2016 06:44AM
Hi there,
recently I have encountered this problem with my printer, I have installed Marlin firmware onto my Prusa I3, the firmware is especially made for the printer but small tweaks have been made.
The printer seizes every time I turn it on and refuses to do anything until it is fixed. I have entered pronterface abd tried connecting to the printer, the information given includes:

Printer is now online.
echo: Last Updated: Apr 14 201627/03/2015 1126h20:02:24 | Author: (Pedro Emanuel, reprap.pt)
Compiled: Apr 14 2016
echo: Free Memory: 3981 PlannerBufferBytes: 1232
echo:Hardcoded Default Settings Loaded
echoconfused smileyteps per unit:
echo: M92 X80.00 Y80.00 Z4000.00 E600.00
echo:Maximum feedrates (mm/s):
echo: M203 X250.00 Y250.00 Z3.30 E25.00
echo:Maximum Acceleration (mm/s2):
echo: M201 X3000 Y3000 Z100 E10000
echo:Acceleration: S=acceleration, T=retract acceleration
echo: M204 S1000.00 T1000.00
echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s), Z=maximum Z jerk (mm/s), E=maximum E jerk (mm/s)
echo: M205 S0.00 T0.00 B20000 X20.00 Z0.40 E5.00
echo:Home offset (mm):
echo: M206 X0.00 Y0.00 Z0.00
echotongue sticking out smileyID settings:
echo: M301 P23.05 I2.00 D66.47
Error:Temperature heated bed switched off. MAXTEMP triggered !!
[ERROR] Error:Temperature heated bed switched off. MAXTEMP triggered !!

I have tweaked the thermistors on the Firmware to:
#define TEMP_SENSOR_0 5
#define TEMP_SENSOR_1 0
#define TEMP_SENSOR_2 0
Note that I was told to set it to 5, if that's wrong please let me know smiling smiley
any help would be nice, thankyou
Re: Thermistor Problem
April 14, 2016 06:59AM
Check the wiring for shorts, thermistors over-read when the resistance is low. It's easy to short the exposed wires on the aluminum heat block if the insulation slips.
Re: Thermistor Problem
April 14, 2016 09:31PM
theres no shortage, everything is in its right place, it was fine before I uploaded new firmware onto it.
Re: Thermistor Problem
April 15, 2016 10:13PM
Make sure the right thermistor is selected, in the right port, and if nothing surfaces be sure that the MINTEMP, MAXTEMP, and other temp related safety features aren't too strict, or enabled at all. Just be sure you get them working again.

Master Tinkerer
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