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Nozzle Heater Overcurrent

#31308 (CORE One) #35308 (CORE One L) #26308 (MK4S) #13308 (MK4) #27308 (MK3.9S) #21308 (MK3.9)

Relevant for

MK4 family
MK3.9 family
CORE ONE family
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What happened?

The printer is showing the message: "Overcurrent detected on nozzle heater."

Error name: Nozzle Heater Overcurrent

Error code: #31308 (CORE One) #35308 (CORE One L) #26308 (MK4S) #13308 (MK4) #27308 (MK3.9S) #21308 (MK3.9)

The error is shown when a damaged wire is on the hotend heater or any of its connections.

How to fix it? 

The most likely cause of this issue is damage to the hotend heater cable. Check the path between the hotend heater and the LoveBoard, and see if any parts are broken or pinched.

If there is no damage, check the cable connection to the LoveBoard board. Try reconnecting the cable to its connector.

In rare cases, this error message can be shown in case of damage to the LoveBoard, the xBuddy board, or the main cable between the two boards. If the cables and connectors are intact, check the boards for any visible damage.

Before opening and manipulating parts and electronic boards, ensure the printer is cooled down and switched off.
Always touch the sides of the electronic board while manipulating it. Avoid touching the chips, capacitors, and other parts of the electronics.

How to access the LoveBoard left side - CORE One 

Using a T10 Torx key, loosen and remove one M3x6rT bolt. Then, release the side cover. 

How to access the LoveBoard left side - CORE One L

Using a 2.5mm Allen key, remove the M3x10 screw on top of the cover to release it.

How to access the LoveBoard left side - MK4/S,  MK3.9/S

Slide the LoveBoard cover upward to remove it from the Nextruder

How to access the xBuddy board - CORE One

Locate the xBuddy board case. Looking at the printer from its rear, it is the rightmost case. 

Using a T10 Torx key, remove six M3x4bT bolts to release the xBuddy box cover. 

The bottom larger board is the xBuddy board, while the top smaller board is the xBuddy extension board. 

How to access the xBuddy board - CORE One L

Locate the Wi-Fi module on the rear panel of the printer. Using a 2.5 mm Allen key, remove the M3x14 screw. Gently pull the Wi-Fi module straight downward to remove it from the printer.

Note that the Wi-Fi module is connected to the electronics with eight spikes.

From the inside of the printer, locate on the rear side the highlighted M3x4bT bolts. 

Using a T10 Torx key, remove two M3x4rT bolts to release the rear xBuddy box cover. Lift the cover to expose the xBuddy and xBuddy extension boards. 

How to access the xBuddy board - MK4/S, MK3.9/S

Access the xBuddy board by loosening four M3x6 bolts. 

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