Experiences with the Wanhao i3 Duplicator

When the screen temperatures shows ‘def’

Some wires may be bad or broken https://www.youtube.com/watch?v=OflKvBUpFno

The connection between the controller and any of the thermistors may be bad https://www.youtube.com/watch?v=-0Mmx65w1d4

[…] The def error occurs when the printer can’t get a read from one or more of the thermistors. In my case, the melzi control board went bad and I had to replace it. It took me a lot of troubleshooting to figure out though and might not be the case for you. […]

Spare parts that might be the culprit: