The extruder suddenly stopped working, print aborted due to detection of cold extruder. Heater LED still on, bed still heating but extruder won’t heat any more. Temperature shows steady decline in heat, so that is working. What could be the solution?
On checking with a multimeter (heater unplugged from board), there is an open circuit on the cartridge heater. I presume this is not normal? Where do I source another heater?
How about checking the wires you have soldered before you think about a new heater?
the printer was working well for 4 weeks. The heater failed mid-print. There is 15volts to the heater when the heater is supposed to be on - but it doesn’t heat and there is an open circuit in the heater itself. I think its broken.
Hi,
Did you check the wiring like Cees suggested?
Yes, I stripped the heatshrink off the solder joints to get a contact for the multimeter. there are no more solder joints between the meter and the heater cartridge. The meter reads 15v when the power light is on, 0v when it is off, and there is an open circuit when I unplug the heater pug at the board and test the resistance in the heater cartridge.
Assuming the heater cartridge is faulty (and its only 2 months old), where can I get a replacement?
15v 30W heaters are hard to source.
I could get a 12v 30w cartridge but presumably I’d need to add a resistor to reduce the voltage (since the wattage will be too high)?
Alternatively, could I simply run it at 15v and rely on the thermistor to keep the temperature down?
Hi There!
I’m facing the exact same problem.
Sometimes the heater cartridge shuts down in mid print.
I checked the wiring and the Board. Anything ok afaik.
Even with shutdown herater cartige the heatbed will heat if swapped to the extruder heater connector.
So the Board should be fine.
If i measure the shutdown heater cartridge it show up around 800MOhm. Seems like an open circuit though.
What resistance value should a working cartridge read?
Sometimes if i wait about an hour or if i just loosen the clamp screw of the cartridge it will suddenly start to heat up again. :o
No! I’m absolutely sure i did NOT overtighten the clamp screw 
Any advice?
BTW. I believe they just use a 12V Heater cartridge powered at 15v. is this correct? (might be a hint for them to fail)
Is this assumption correct?
[quote=“brian25”]Assuming the heater cartridge is faulty (and its only 2 months old), where can I get a replacement?
15v 30W heaters are hard to source.
I could get a 12v 30w cartridge but presumably I’d need to add a resistor to reduce the voltage (since the wattage will be too high)?
Alternatively, could I simply run it at 15v and rely on the thermistor to keep the temperature down?[/quote]
Hi brian.
I read about that googling around about the E3D Hotend which comes with a 12v 40w cartridge.
There is some settings to tweak in the firmware setup in Marlin. This way you can reduce the current the board supplies to the heater.
That should make it run safely with a 12 v heater too.
I just don’t remember the address wher i found that.
I think googling about that will show you up the page.
Yes.
I’m running mine over-voltage at 24v. It’s advisable to run a PID tune or you’d get large overshoots due to the faster temperature rise time.