The printer is showing the message: "Unexpected invalid current".
Error name: MB invalid current
Error code: #17303
An LED on the Modular Bed lights up when this error occurs. The error indicates an issue with the current flowing into the Modular Bed and its heatbed tiles.
Inspect the wiring between the Sandwich board and the Modular Bed for a loose connection, or a broken cable.
Inspect the modular bed for physical damage, such as scratches on any of the heatbed tiles surface.