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Confirm that you have the heater cartridge lead and the thermal safety fuse leg inserted in the through holes of the HE280 Hotend PCB board.

In photo #1 the heater cartridge lead is on the left (indicated by the + on the HE280 Hotend PCB board) and the thermal safety fuse is on the right. (noted with blue arrows)

Confirm that the thermistor legs are inserted into the correct through hole location (marked with red arrows in the picture) on the HE280 Hotend PCB board.

Using your soldering iron, solder all 4 through hole connections.

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