BAMBU LAB P1S Heating Up

Industrial Grade MicroSD Card

The P1S streams G-code directly from the SD card during the print process. A corrupted sector at the specific memory address of the bed-heating command (M190) causes the processor to enter a wait-state loop, appearing as a UI hang while the printer waits for the next instruction that it cannot read.

AC Power Board

This board contains the Solid State Relay (SSR) responsible for switching the high-voltage AC current to the heatbed. If the SSR fails in a closed state due to thermal fatigue or a voltage spike, the bed will continue to heat indefinitely regardless of the logic board's target temperature, preventing the 'ready' signal from ever being triggered in the firmware.

Toolhead Filament Sensor Cable

A break or intermittent signal in the filament sensor cable can trigger a hidden error state. Because the P1S UI prioritizes the 'Preheating' display, a background fault in the filament path will stall the print sequence, but the user only sees the last successful command, which was the heatbed activation.