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How to find out what is wrong: lets show the error messages!
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You are having a problem with your printer? Here is how to check for error messages!
Checking Error Messages
The LCD on the printer does not show error messages. But the printer does give error messages! You can see the printer log during printing, by connecting your printer to the computer.
Download the free software Pronterface (also known as Printrun). With this software, you can connect to your printer from a computer, using a USB cable, and even print gcode files over the cable. This software will show you the raw log out of the printer, which is where any major errors are reported to. You can then search the error you see in google, or ask on one of the JGAurora support groups.
After installing Pronterface, connect to the printer using Baud 250000, and choose the correct serial port for your printer.
Drivers
If you can't connect to any serial port, you may need to install drivers for the CH340 USB chip. To find your serial port (also known as COM port), unplug the printer, and see which com ports are currently listed. Plug the printer USB cable in, and see if any new COM ports appear. Those will likely be your printer. If you can’t find the right com port, or your device is not detected, you may need to install drivers for the CH340 serial to USB interface chip in the printer. Mac CH340 serial drivers are here. PC CH340 serial drivers are here. On a Mac, if you have problems with the free drivers, there are much more reliable paid drivers that can be purchased here.
If you see an error about “MIN_TEMP” the printer has detected a temperature that is too low, and it thinks that a sensor is either damaged or missing. For safety, the printer will then refuse to heat up, to prevent burning your house down! There is a broken wire, or loose connection somewhere. Perhaps a leg of the thermistor has broken off, or a cable is detached or loose?
If you see an error about “HEATING FAILED” this means that the printer did not detect a sufficient change in temperature while heating up. This is a safety feature, and suggests there is a fault with wiring somewhere - energy is going in, but it is not ending up in the bed. Perhaps there is a loose connection somewhere - for example the heated bed connector may be damaged.
You may also want to check the FAQ for solutions to common problems.
