Error code 802 on the Elegoo Centauri Carbon 2 Combo indicates that the port on the pressure sensor adapter board is not communicating correctly. This adapter board sits between the main electronics and the pressure sensors used for bed leveling; when the board’s connector or the board itself fails, the printer cannot perform probing and halts with error 802.

What the Error Means

The Centauri Carbon 2 Combo uses strain-gauge pressure sensors to measure nozzle contact force during bed leveling. Those sensors connect to the motherboard through a dedicated adapter board. Error 802 fires when the adapter board port returns an invalid or absent signal, which prevents reliable leveling data from being collected. This is a separate fault path from error 801 (CANbus tool-head communication); error 802 is specific to the pressure-sensor adapter board subsystem, not the general tool-head communication bus. Causes include a loose connector on the adapter board, a physically damaged adapter board (burnt components or cracked PCB traces), or a failed pressure sensor element upstream of the board.

Step-by-Step Fix

1. Power off the printer and unplug it from mains power before touching any internal electronics.
2. Locate the pressure sensor adapter board inside the printer. Refer to the ELEGOO Centauri Carbon 2 Combo assembly guide or the ELEGOO Wiki for the exact board position in your build.
3. Inspect the connector seated on the adapter board. Press it firmly until it is fully and evenly seated — partial connection is a frequent cause of intermittent communication errors.
4. Examine the adapter board surface under good lighting for visible damage: burnt or discolored components, cracked solder joints, or physical impact marks. A damaged board must be replaced.
5. Reconnect the printer and run a bed leveling operation to test. If error 802 clears, the fix is complete.
6. If error 802 persists after reseating, replace the pressure sensor adapter board following the ELEGOO Wiki replacement guide for this component.
7. If a replacement adapter board also produces error 802, the pressure sensor itself or the connecting cable may be faulty — contact ELEGOO support for further diagnosis.

Parts Required

• Pressure sensor adapter board (replacement unit, if board is damaged)
• Replacement pressure sensor (if escalated diagnosis confirms sensor failure)

Contact ELEGOO support if error 802 continues after adapter board replacement, providing photographs of the board and any visible damage to help their team identify the root cause.

Frequently asked questions

What does Elegoo 802 mean?

Error code 802 on the Elegoo Centauri Carbon 2 Combo indicates that the port on the pressure sensor adapter board is not communicating correctly. This adapter board sits between the main electronics and the pressure sensors used for bed leveling; when the board's connector or the board itself fails, the printer cannot perform probing and halts with error 802.

How do I fix Elegoo 802?

Error 802 on the Elegoo Centauri Carbon 2 Combo points to the pressure sensor adapter board connection. Follow these steps to diagnose and resolve it.