What happened?
The Prusa CORE One L is equipped with a power supply that includes an internal temperature sensor. In the case of an implausible temperature sensor reading, the printer halts its operation and displays the message "Temperature sensor of the heated bed is shorted".
Error name: AC Controller Fault
Error code: #35273
How to fix it?
Check the heatbed cables. Inside the printer chamber, use the T10 screwdriver to remove the two M3x4rT screws that hold the electronics cover in place. Be careful not to loosen the lower middle screw. It should stay tightened.
Then, on the back of the printer, check the heatbed data cable that connects to the top of the AC box.
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If the cable is correctly connected, contact our Technical Support with the info on when this error occurred.