[Ultimaker ER3 Heater Error]

Hi GR5, thanks for the detailed info. I have updated the firmware on the UM2E and it's still the same. I guess it's the control board.

On the other hand, I want to increase the nozzle dia from 0.4 to 0.8mm for some big parts in PETG, any advice in the print settings? Thanks!

[Ultimaker ER3 Heater Error]

In addition, but not to confuse the issue, twice now the printer would drop in the z direction while the step motor made some really nasty mechanical noise. The printer would continue printing there and made a mess. I'm prepared to order a new control board because I don't believe these are coincidences. Thanks for the help.

[Ultimaker ER3 Heater Error]

Hi, my UM2E would intermittently throw an ER3 error in the middle of a print. I've read many of the related posts and followed their suggestions. I have checked (visually, connections, moving the wires, and measured the resistance (about 25 Ohms)) the heater cartridge and it seems to be fine. If I reset the system, it would start heating up again but not always. Sometimes when I tried to preheat the nozzle and measured at the heater 1 terminals, the voltage was zero. Another time while preheating, the system would get out of the preheat mode by itself. I have tried Cura 3.3.1, 3.4.1, and 3.5.1 but the problems seem to persist. Any ideas on what's wrong and what should I do to troubleshoot next? Could there be multiple issues? Thanks for the help.