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Print head won't heat up

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My ultimaker 2 is just a few months old but the print head stopped heating up during a print. I thought it was just clogged so I went to the move material page and that's when I found that the temperature was falling slowly 70/210 then 45/210. I mistakingly pushed the factory reset button and now it's stuck at the "heating up printer head"stage with the temperature indicator light bar not moving. It's too bad it was working perfectly for months.

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I would first check the cable connection of the heater cartridge. This is a direct cable without connectors to the electronics board. Take of the cover at the bottom, 2 bolts. Its 2 white cables, you'll see the marking on the board.

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