Prusa Mendel hot end temp issues, help please

Hi,

I am a first time builder working on a prusa mendel with RAMPS 1.4, 100k glass thermister and I uploaded marlin firmware.

For some reason, when I load ponterface it reads room temperature between 100-110 degrees. When I try to heat the hot end it will heat to around 170 degrees, but that seems to be its limit. However, I do not have a laser thermometer to test what the real temp is.

I have checked the wiring and firmware several times and do not see any issues. Has anyone else had this issue? Any idea on how to fix this?

Thanks,
Steve

Try swapping the thermistor connector with the heat bed thermistor (if you have on of course) and see what that reads

I swapped out both the resistor and thermistor before I posted. It still reads the same.

I have not set up a heated bed yet. I have a PCB heatbed MK1. But I was going to wait to set it up until I had the hot end working. One thing at a time.

I'll try to set up a thermistor on the heat bed slot on the board and see if I get a different reading.

Thanks.

Check the thermistor resistance while your at it - it should read about 100k ohms at room temp.