Heatbed Port Overcurrent #31309 (CORE One) #35309 (CORE One…

What happened?

Your printer is showing the message: "Overcurrent detected on xBuddy/Buddy heatbed port, disconnect the device."

Error name: Heatbed Port Overcurrent

Error code: #31309 (CORE One) #35309 (CORE One L) #26309 (MK4S) #13309 (MK4) #27309 (MK3.9S) #21309 (MK3.9) #28309 (MK3.5S) #23309 (MK3.5) #12309 (MINI)

The error is shown when there is a damaged cable on the heatbed or any of its connections.

How to fix it?

CORE One L

Do not access or remove panels or disassemble components on the heatbed and surrounding parts, including cables, as this can pose a safety risk due to electronics.

Report the issue to our 24/7 technical support, and we will guide you through the next steps.

CORE One, MK4/S, MK3.9/S, MK3.5/S, MINI/+

Before manipulating any cables or electronic components, ensure the printer is fully cooled down to room temperature and switched off.
Avoid touching the surface of the xBuddy/Buddy mainboard, touch it only from its edges.

The most likely cause of this issue is damage to the heatbed cable. Check the path between the heatbed and the xBuddy/Buddy board, and see if there are any parts that are broken or pinched.

In case there is no damage, check the cable connection to the heatbed and to the xBuddy/Buddy board. Try reconnecting the connectors.

In rare cases, this error message can be shown in case of damage to the mainboard. So if the cables and connectors are intact, try checking the board for any damage.


CORE One heatbed	MK4/S, MK3.9/S, MK3.5/S heatbed

xBuddy board (CORE One, MK4/S, MK3.9/S, MK3.5/S)


MINI/+ heatbed (bottom)	MINI/+ heatbed (top)

MINI/+ Buddy board	MINI/+ Buddy board

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21 comments

Danshari

•

I checked all the connections, no issues. I'm guessing they sent me a bad board.

Henk

•

I checked all the cables and connections from the buddy board to the Heatbed I could not find anything wrong. I measured the resistance of the heatbed (MK4S) it was approx 3 Ohm.
I checked also the cables from and to the power supply. All OK, no short no open or intermediate connections found and also no bad isolation. The Buddy board does not show any visible damage.

After reassembling and running all tests, it worked well for3 Prints. Then the error message came again.
I preheated the bed to approx 40C first and then started a print the "normal" way, no problem anymore, The next 3 print (up to now) no problems.

To me it looks that sometimes the overcurrent detection is too sensitive. It has problems with the inrush current when Bed and Nozzle start heating together. Maybe the power supply has a problem with the start current, however it had no problem with it the last 1.5 years. I do not have a an oscilloscope the measure the inrush current.

Or it is some other firmware bug...... Maybe Prusa can look into the issue and give feedback.

agi897123

•

Although the heatbed connectors seemed firmly tightened, that was the issue. Stuck a blade between the nut and the 3d printed nut housing so I could really tighten the connectors. The problem didn't resurface for the following 2 test prints.

agi897123

•

Nevermind. The issue keeps resurfacing every few hours/days. Extremely unreliable product and cheaply made (printed) critical parts.

Brandonforgie

•

So I constantly get this error. And cable is fine. Heat bed is fine. Not sure about the buddy board.
But when this happens, if I first preheat the printer to what ever filament I’m using, and let the printer get up to temp, then start what ever print. I no longer have the printer error out and restart. Leads me to believe it’s a coding/programming issue somewhere.

LuMaHa

•

With Firmware 6.2.4+8909 (MK4), this message also gets triggerd by overcurrent in the hotend heater-circuit, which is confusing and should be fixed.