I purchased it new from Amazon in December. It started about one week ago and it just stops with a constant beep and does not allow me to do anything else except turn it off. Doesn't happen on all prints but just loses its brain.

It does save the printing but I must shut it down manually and then it picks off where it left off but still does the same thing. Printing a bonsai bowl and other things and it goes to 0 °C. Is this something I am doing incorrectly or is it a defect in the unit? To me sounds like a defect.

  • $\begingroup$ If you feel that it is a defect, have you contacted the seller on Amazon? Will Amazon accept it back? $\endgroup$
    – agarza
    Feb 3 at 4:33
  • 3
    $\begingroup$ The constant beep is an alarm, which most probably is a warning for "Thermal runaway", look also here for hints (e.g. cooling fan related?). Another possibility is that the cable to the heated bed or the heater element is almost broken and loses connection after a while, please check the cables. If this helps, we can create an answer for you to accept, else we need to look further. $\endgroup$
    – 0scar
    Feb 3 at 7:58

1 Answer 1


Did you check the voltage setting on the back of the unit?

There is a semi-hidden switch that can be flipped to go from 230 volts to 115 volts. If you are in the US, you want to print on 115 volts.

  • 3
    $\begingroup$ Hi David, welcome to 3DPrinting.SE! Your answer reads more like a comment, or is it proven that the wrong switch setting leads to this behavior as described by the OP or have you had the same experience in which it was solved with your suggestion? If not we should move the answer to a comment. Please take the tour and read our help center! $\endgroup$
    – 0scar
    Apr 27 at 21:04
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    $\begingroup$ It seems quite unlikely that an incorrect mains voltage selection would cause the OP to stop working mid-print. If the incorrect voltage was selected it would seem more likely that the printer just wouldn't start (or the PSU would fry)... $\endgroup$
    – Greenonline
    Apr 28 at 0:03
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    $\begingroup$ 115 on the switch in 230 V blows the fuse, 230 V while plugged into a 115 V socket does not start $\endgroup$
    – Trish
    Apr 28 at 13:05
  • $\begingroup$ Hey, guys, I am the new owner of two Creality Ender 3 V2s, living in the US. On one printer I remembered to flip the switch from 230 volts to 115 volts, and on the second I did not. The second printer would print for about an hour before emitting a high pitched continuous beeping that I could only stop by turning off the printer. When I flipped the switch from 230 volts to 115 volts, this problem stopped. So my original comment was both a comment and potential answer. $\endgroup$
    – David Fox
    Apr 29 at 16:10

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