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I have a HICTOP 3DP11. Today while printing, there was a spark from the extruder heater core and the temperature started to drop.

I unplugged the printer and waited. Now when I plug in the printer, the extruder heater automatically turns on and starts heating. The temperature will keep climbing until I unplug the unit.

Could it be caused by a deffective heater core? Will replacing it fix the issue or is the board fried as well.

1 Like
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Hey Fegre,

It may be the heater core as you’ve said, but I had a similar problem not so long ago. The problem may be a faulty thermistor (temperature sensor). To be sure I’d need to know a little more. Can you please explain in more detail what happens. Is it physically hot or is it still cool to touch, but registered as hot.

Hopefully I can help you if you give more explanation.

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It’s physicaly hot. I tried a different thermistor with same results. I also tested the resistance of the heater core and got 14.1 ohms. Should be within limit for a 24v 40w.

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Got a response from HICTOP. They sent me a firmware to start using the E1 extruder port as it seems the E0 extruder port is defective. If that works, I will try to get a new board from them under warranty as I plan to add a second extruder in the future

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That’s good to hear. Usually the printer company can sort you out, so it’s good that they’ll do it under warranty. Hope it all works out.