Nozzle and Plate Heaters Will Not Come On

Neither the hot head nor plate heaters will turn on, and head temperature
readout indicates 460-500 Deg C, although everything is actually cold.
Plate temp reads correctly, but the plate heat will not come on either. I
pulled the thermistor leads from the RAMPS board, and checked
resistance compared to a new thermistor, and the thermistor reads
correct compared to others at room temp.

This is a Folgertech
Kossel 2020 (rev a) with Ardino 2560 and RAMPS Shield.  Repetier Host
V1.6.1  I have also checked all of the power lead terminals for
tightness.

The machine itself moves normally. I alao the Emergency Stop, and rebooted everything, including my Laptop, with no success.

Has anyone had a similar problem?  Unless someone
has some troubleshooting things I can try, I suppose the next step is to
order a new RAMPS board?

Comments

  • You need to make sure the pin configuration is correct in the firmware.  You also need to ensure the correct thermistor type is selected in firmware.
  • With these reading sfirmware will go into dry run, see log. So it is either returning wrong resistance due to a short, you have a wrong thermistor type slected or connected to the wrong pins. Somethink like that.
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