<p>A firmware is configured with settings which are stored in the chip called EEPROM. EEPROM  is short for Electrically Erasable Programmable Read-Only Memory which is a kind of non-volatile memory (see <a href="https://en.wikipedia.org/wiki/EEPROM" rel="nofollow noreferrer">wikipedia</a>). It is the chip thar stores the firmware settings you generally see when you command the <code>M503</code> G-code (see <a href="https://3dprinting.stackexchange.com/questions/11438/m502-will-reset-all-configurable-settings-to-their-factory-defaults-which-set">M502 will reset all configurable settings to their &quot;factory defaults&quot;, which settings are those?</a>) in a terminal (<a href="https://3dprinting.stackexchange.com/questions/10573/what-is-a-printer-console-terminal">What is a printer console/terminal?</a>).</p>
<p>The Creality controller board V4.2.7, with a 32-bit microprocessor (most 32-bit microprocessors do not have a EEPROM), stores the data on an SD card, not in the EEPROM. But, the firmware thinks that the EEPROM is used, it is merely a file on the SD card. This could hint to the errors that you are receiving.</p>
<p>To solve this, you need to insert a working SD card (format the SD card as FAT32) in the machine and keep it there.</p>

CC BY-SA 4.0
2024-02-18T13:37:10.490Z
2024-02-18T13:37:10.490Z
0scar
<p>A little context might be important to troubleshoot this: Last year, I have changed the extruder and the entire hot end piece of my Ender 3 Pro. One day, while cleaning the nozzle with a metallic brush, something on it short circuited and this bricked my mainboard.</p>
<p>Recently, I have changed the broken 4.2.0 mainboard with a brand new 4.2.7 one. Everything seemed to be fine until I attempted to pre heat the nozzle again to 200 °C.</p>
<p>Every time the nozzle reaches around 100 °C the printer starts beeping loudly and resets continuously until the nozzle cools down to room temperature.</p>
<p>I have it connected to OctoPrint and I could see that there were no errors being logged apart from it saying that there was no SD card and no EEPROM.</p>
<p>What can I do to further troubleshoot this error? Is there anything from the OctoPrint side that could provide more information?</p>

<troubleshooting><creality><heating-element>
Ender 3 Pro Beeping when Hot End Reaches 100 ºC
Ícaro Lorran
# Ender 3 Pro Beeping when Hot End Reaches 100 ºC

(Asked by: username_0 on 2024-02-18)

A little context might be important to troubleshoot this: Last year, I have changed the extruder and the entire hot end piece of my Ender 3 Pro. One day, while cleaning the nozzle with a metallic brush, something on it short circuited and this bricked my mainboard.

Recently, I have changed the broken 4.2.0 mainboard with a brand new 4.2.7 one. Everything seemed to be fine until I attempted to pre heat the nozzle again to 200 °C.

Every time the nozzle reaches around 100 °C the printer starts beeping loudly and resets continuously until the nozzle cools down to room temperature.

I have it connected to OctoPrint and I could see that there were no errors being logged apart from it saying that there was no SD card and no EEPROM.

What can I do to further troubleshoot this error? Is there anything from the OctoPrint side that could provide more information?

**Tags:** troubleshooting, creality, heating-element


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## 1 answers

### Answer by username_1 on 2024-02-18. Score: 2

A firmware is configured with settings which are stored in the chip called EEPROM. EEPROM is short for Electrically Erasable Programmable Read-Only Memory which is a kind of non-volatile memory (see [wikipedia](https://en.wikipedia.org/wiki/EEPROM)). It is the chip thar stores the firmware settings you generally see when you command the `M503` G-code (see [M502 will reset all configurable settings to their "factory defaults", which settings are those?](https://3dprinting.stackexchange.com/questions/11438/m502-will-reset-all-configurable-settings-to-their-factory-defaults-which-set)) in a terminal ([What is a printer console/terminal?](https://3dprinting.stackexchange.com/questions/10573/what-is-a-printer-console-terminal)).

The Creality controller board V4.2.7, with a 32-bit microprocessor (most 32-bit microprocessors do not have a EEPROM), stores the data on an SD card, not in the EEPROM. But, the firmware thinks that the EEPROM is used, it is merely a file on the SD card. This could hint to the errors that you are receiving.

To solve this, you need to insert a working SD card (format the SD card as FAT32) in the machine and keep it there.


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