Preheat Error

If you find this error when you preheat the bed to ABS temps (100C), please try the following troubleshooting steps:

  • Inspect the leads for the thermistor, make sure that it is still secured to the bottom of the heat bed
  • Remove the cable cover from the back of the heated bed and inspect the leads to ensure they are still intact and soldered securely to the pads
  • Make sure the heatbed connector is fully seated into the socket on the RamboMini (you should routinely check this in general!)

If you've checked all the above and everything is in order. Please reflash with the latest firmware found at

After reflashing, if the issue still exists please contact support at

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