I have a printer ultimaker 3 Extender which has had problems especially in long impressions when it stops saying in the indicator ER15 which is something related to the temperature sensors of the print core as I understand, we try to change the print core as the page "https://ultimaker.com/en/resources/23149-heater-error-on-printcore" said but the error happened again, by checking the monitoring of the print I noticed that in a flash shot to 700 someone could help me with this thanks