Problem with Marlin and ramps 1.4 (MINTEMP triggered)

When I try to control my ramps 1.4 to my computer using Pronterface, i get this error:

Connecting...
start
Printer is now online.
echo: External Reset
Marlin 1.0.0
echo: Last Updated: Nov 30 2013 14:43:11 | Author: (none, default config)
Compiled: Nov 30 2013
echo: Free Memory: 3383 PlannerBufferBytes: 1232
echo:Hardcoded Default Settings Loaded
echo: Steps per unit:
echo: M92 X160.00 Y160.00 Z5120.00 E100.32
echo:Maximum feedrates (mm/s):
echo: M203 X500.00 Y500.00 Z5.00 E25.00
echo:Maximum Acceleration (mm/s2):
echo: M201 X9000 Y9000 Z100 E10000
echo:Acceleration: S=acceleration, T=retract acceleration
echo: M204 S3000.00 T3000.00
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
echo: PID settings:
echo: M301 P22.20 I1.08 D114.00
echo: SD init fail
Error:0
[ERROR] Error:0

: Extruder switched off. MINTEMP triggered !
Error: Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)
[ERROR] Error: Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)



D10 is connected to my extruder heater and T0 is connected to my extruder thermistor


What should i do to fix this problem?

Thanks!

Edited 1 time(s). Last edit at 11/30/2013 02:54PM by bardiaesm.

What it's telling you is that your thermistor is reading below the lowest possible temperature. Either there is a problem with the thermistor or your room is *very* cold. The most common problem is a thermistor that is simply not plugged in.

1) Check your thermistor cable with an ohm meter, it should read about 100 K ohms at the connector that plugs into your Ramps board
2) Make sure it's plugged into the correct plug on the board
3) If you do not have a heated bed, make sure it's thermistor is set to "not present" (zero) in the firmware
4) Make sure your thermistor type is set correctly in the firmware.
5) Make sure your mintemo is set to something rational in the firmware (5C is rational, 25 is not).

My bet would be a thermistor that's not plugged in ...

Quote
uncle_bob
What it's telling you is that your thermistor is reading below the lowest possible temperature. Either there is a problem with the thermistor or your room is *very* cold. The most common problem is a thermistor that is simply not plugged in.

1) Check your thermistor cable with an ohm meter, it should read about 100 K ohms at the connector that plugs into your Ramps board
2) Make sure it's plugged into the correct plug on the board
3) If you do not have a heated bed, make sure it's thermistor is set to "not present" (zero) in the firmware
4) Make sure your thermistor type is set correctly in the firmware.
5) Make sure your mintemo is set to something rational in the firmware (5C is rational, 25 is not).

My bet would be a thermistor that's not plugged in ...

uncle_bob I am facing the same problem now. I've checked the thermistors and they are plugged in correctly, but they still show the error message

If everything is hooked up 100% right, and all the firmware is 100% correct, and the Ramps is fine, and you get a mintemp error -- your Mega is probably blown. It's the only thing that's left ...

About the only other test is to short the thermistor input pins and look for a maxtemp error. If you don't see that, it sort of says the same thing. You are not getting a signal from the thermistor pins through the Ramps board into the mega on the pin that the Mega *thinks* is the thermistor input.

The RAMPS board supports 3 thermistors, so in case if there is only one extruder, we can use extra PIN (usually T2) - move T0 connector to T2 and change firmware pin setting.

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My [www.thingiverse.com] stuff, my configuration of Repetier 0.92.6: [forums.reprap.org] (use Arduino 1.6.5 to compile)