Some people experience a frustrating beeping noise from their 3D printer, whether it’s an Ender 3 or similar machine. I decided to look into this issue and find some ways that you can fix this issue once and for all.
Keep on reading to learn how to fix a 3D printer screen that keeps on beeping.
How to Fix Ender 3 Screen That Keeps Beeping
Here is how you can fix an Ender 3 screen that keeps beeping:
Set the right voltage on the power supply
Plug into a wall socket rather than external power supply
Connect the LCD cable to another connector
Use the original or different SD card
Connect the thermistor wire at the hotend properly
Replace a bad thermistor
Update the firmware
Replace your faulty motherboard
1. Set the Right Voltage on the Power Supply
One way to fix an Ender 3 screen that keeps beeping is to set the right voltage on the power supply. Many users have found that when their Ender 3 keeps making those loud beeping sounds, it was when they had used the wrong voltage rating on their power supply.
The Ender 3 has two voltage ratings which can be switched, being either 115V or 230V. This should be set according to what country you are in and what the local mains run on.
If you are in the US, you’ll be using the 115V setting. You just need to find that red switch on the Ender 3 and change it if it’s on a different voltage.
Some appliances will have 110V, 115V or 120V, but they are really all the same in this instance. Most European countries use 230V, but double check that.
2. Plug into a Wall Socket Rather Than External Power Supply
A similar issue with the power is if you are using an external power supply.
One user experienced this beeping sound when the bed started pre-heating and beep randomly when the heater turned back on. He used a UPS (Uninterruptible Power Supply) unit to power up the Ender 3, which was capable of up to 750W.
The issue was fixed by plugging the Ender 3 cable directly into the wall socket.
3. Connect the LCD Cable to Another Connector
If you connected your LCD cable to the wrong connector, it can also cause this beeping sound on an Ender 3.
One user suggested that this could be the issue since there are three connectors. You should connect the LCD cable to the furthermost left slot to see if it solves your issue. Another user confirmed that this helped them fix the issue.
You can also simply try unplugging and reconnecting your display.
Another way to fix the beeping noise in an Ender 3 is to change the SD card back to the original one or use a different card.
One user said that a friend of his was experiencing this issue and ended up solving it by using a different SD card. If you don’t have access to the original SD card, you can buy a good one from Amazon like the Verbatim 8GB Premium SDHC Memory Card.
5. Connect the Thermistor Wire at the Hotend Properly
Another reason that your Ender 3 can keep beeping is if the thermistor wire at the hotend isn’t properly connected. One user who had this issue said it happened after he rebuilt his hotend.
It ended up being that the thermistor in the heat block was not in the hole far enough, leading to one of the leads shorting on the block.
In this instance, you just need to re-seat your thermistor deep enough to where the wire reaches the heat block. Some wires can be short on thermistors, so it can be difficult to get them all the way back inside.
Make sure the 3D printer is off while you are doing this. You’ll need the 1.5mm Allen key, a screwdriver, and scissors or flush cutters.
If the thermistor wasn’t properly installed at the factory, it could have come loose over time from all the printer movements.
Another user said he replaced his hotend and the thermistor moved out of the heat block before tightening it. He fixed it by making sure it was further in.
A similar issue is if you screw in the thermistor too tight, since it’s not built to be tightened a lot. It should just be held in place within the hole, so you should slightly loosen the screw holding the thermistor and make sure you stop tightening it when there’s resistance.
You need to take the hotend fan off, then loosen the screw that is holding the thermistor lead wire in place, but not too much.
A user had experienced beeping sounds and a thermal runaway error message on their Ender 3. He had to reposition and loosen the screw holding the thermistor’s lead wire in place to fix this issue.
Check out the video below to see how an Ender 3’s beeping screen was fixed with the thermistor wiring.
6. Replace a Bad Thermistor
Another issue that can make the Ender 3 screen keep beeping is a bad thermistor. The Ender 3 has two thermistors, one on the hot end and another on the bed. If any of these thermistors goes bad, it can affect the printer and cause this beeping.
You can purchase thermistors pretty cheap from Amazon. I’d recommend something like the HICTOP 100K Ohm NTC 3950 Thermistors. They have a good length and comes with multiple so you can have replacements.
To replace a bad thermistor, check out the video below. I also wrote an article called 3D Printer Thermistor Guide that goes through more information about thermistors.
7. Update the Firmware
Some users have fixed the beeping issues on their Ender 3 by updating the firmware, especially if they recently installed a BLTouch auto levelling sensor.
You can easily find the official Creality firmware downloads on their website. Make sure you are downloading the right version for your current setup.
It can be tedious to update the firmware on an original Ender 3 because it doesn’t have a certain feature called a bootloader that allows easier firmware updating.
Teaching Tech made a great video on how to install a bootloader then update firmware on an Ender 3.
If you have the newer 4.2.2 board on an Ender 3, then you can follow the video below.
8. Replace Your Faulty Motherboard
If after trying all the steps listed above, the Ender 3 screen keeps beeping, you might have a faulty motherboard. There are many guides on how you can replace a motherboard/mainboard on your 3D printer.
It can take quite a bit of time if you haven’t done it before, but once you learn the steps, you’ll be better informed about your 3D printer and hopefully fix the beeping issue at the same time.
If your Ender 3 is under warranty, you can contact the seller for a refund or replacement of the mainboard, and in some instances, the whole 3D printer. If the board is out of warranty, consider replacing it yourself.
One user had a beeping issue with their printer and had to replace the motherboard to solve the issue after all other solutions didn’t work.
One user said that when he bought the Ender 3 Pro he had a similar screen to another user that had the beeping sound, but without the beeping. The cause was a dodgy motherboard, so he got it replaced and it started working again.
The user confirmed that the issue was solved after he changed the motherboard after he upgraded to an SKR Mini E3 V2.0 board. It’s a great upgrade since it has a silent driver and should make your 3D printer run smoother.
How to Fix Ender 3 Random Beep
Here’s how to fix random beeps on an Ender 3:
Turn off printer, unplug screen, then re-plug it
Ensure a good connection between the monitor and main frame.
Disconnect other plugs in the same outlet
Install ferrite beads
Replace your faulty motherboard
Turn Off Printer, Unplug Screen, Then Re-Plug it
One simple way to fix an Ender 3 that randomly beeps is to turn your 3D printer off, unplug the screen, then plug it in again. One user did this and said it worked to fix his beeping issue.
Ensure a Good Connection Between the Monitor and Main Frame
This is quite a technical one, where there is a grounding issue with the display board. Many users have mentioned this being the cause of why their Ender 3 was beeping.
Basically, the display of the Ender 3 needs to be grounded to the frame. It’s normally done through the bracket and screws that hold the display to the frame.
One user mentioned that he tried to rest his hand on a screw head on the Ender 3 frame along with another screw that holds the display board in place, and the problem went away until he removed his hand.
After that, he tightened the hex screws that hold the display bracket to the Ender 3 frame and it helped to clear the problem up. He mentioned that he would ground the display board to the frame with a dedicated wire, though this is quite technical stuff.
Another user explained that it’s an issue with the power being delivered across two flat molded cable connectors, along with a small gauge wire in the cable. Each time the power fluctuates, it spikes at the load.
A user said that he fixed this by sanding the back of the display panel so it created a good bond to the frame. Some users have 3D printed small spacers to go between the screen’s frame and the extrusion.
There are some unique experiences with this fix. Someone said that they put in a back cover to the panel and attached it in a way to break the grounding of the PCB to the chassis via the screws.
If you manage to put get something between the screw and the PCB, it should help fix this particular issue.
Disconnect Other Plugs in the Same Outlet
Another method of fixing random beeps in an Ender 3 is to disconnect other plugs in the same outlet as your Ender 3. A user said he had a Philips Hue desk light in the same outlet and that caused the beeps for some reason.
Another user said he installed LED strip lights inside his enclosure and started getting these beeps every 5-10 seconds. After he unplugged the LED light, the beeping stopped immediately.
Install Ferrite Beads
Installing ferrite beads has also worked for some users to fix this beeping noise. One user said he got some ferrite beads installed and hasn’t had any beeping during the few days he had been running it afterwards.
The stepper motors on an Ender 3 can be source of RF interference, so the ferrite beads held to fix this issue. He said he installed them on both ends of the power adapter for his LEDs, as well as the outputs on his LED transformer and both ends of the LCD cable.
I don’t know too much about ferrite beads, but it seems to have worked for some. Here’s a set of Ferrite Beads on Amazon that you can check out.
Replace Your Faulty Motherboard
A faulty motherboard can also make an Ender 3 V2 beep randomly. To fix this, the motherboard has to be replaced.
One user had an Ender 3 Pro with a blank screen that beeps when turned on. Replacing the thermistor, updating the firmware, and checking the printer’s connection didn’t solve the problem.
The problem was solved with the replacement of the Ender 3 Pro motherboard. It was replaced with an SKR mini E3 v2.0.
You can check out this video by BIGTREETECH for a step-by-step installation of a BTT SKR Mini E3 V2 motherboard.
Michael Dwamena is the founder of 3D Printerly, a platform dedicated to simplifying 3D printing for hobbyists and professionals alike. Owns over 20 3D printers (filament and resin) and has plenty experience 3D printing. Michael has authored over 900 articles, helping millions navigate the exciting world of 3D printing.
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