I upgraded my Ender 3 Pro from the stock 8-bit motherboard to a new 32-bit 4.2.7 motherboard. No problems were encountered with the swap, flashing of the new firmware, or calibration.
When I went to start the first test print, the firmware throws the E1 Error: "
Heating Failed: E1; PRINTER HALTED; Please Reset".
When the print started, the bed heated up to the requested 60 °C, and then started warming the print head to 210 °C. Once the print head reached 205 °C, the temperature started to drop. It dropped back down to 200 °C, then up to 202 °C then down to 198 °C and so on. It kept doing the up and down heating until it dropped to 190 °C at which point the E1 error was displayed. I have run through the cycle several times with different prints, and through the menu options; and it always fails in the same up and down way.
- Ender 3 Pro
- Upgraded motherboard 4.2.7 (silent stepper drivers)
- Matching upgrade of Marlin to version 2.0.6 (downloaded from Creality)
- PEI print bed
- Replacement bed springs
- everything else is stock
Prior to the upgrade, everything worked fine. I printed several small prints the day before without a problem. After the upgrade the E1 error.