The printer will display the message "Check the heatbreak thermistor wiring for possible damage" if the heatbreak temperature measures more than 100 °C at any point. In this case, the printer will stop the heating and display the message on the screen.
Error name: Heatbreak Maxtemp error
Error code: #17212
Most often, this error happens due to wiring damage or connection issue on the heatbreak thermistor cable.
Check the Dwarf board where the heatbreak thermistor resides, to ensure that no wires have broken off or are disconnected.
Place an empty Prusament cardboard box approximately to the front center part of the heatbed. Move the X-axis all the way to the front side of the printer, and move the extruder approximately to the center of the X-axis.
Open the dwarf-cover-door to access the Dwarf board. Check that all the connectors are secure in their sockets, according to the picture below. Focus on the heatbreak thermistor cable. Though unlikely, rough shipping or handling could have shaken the heatbreak thermistor cable loose.