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Bambu Lab Faults
3 documented Bambu Lab faults, covering P1S, A1 Mini and A1. Each entry sets out the symptom as owners report it, the most likely cause, the checks that confirm or rule it out, and whether the repair is worth doing. Everything here is compiled and cross-checked from manufacturer documentation and owner reports — the sources are listed on every page.
Documented faults
- Bambu Lab P1S
Heatbed temperature does not rise during print preparation, or the bed simply never heats after a bed temperature is set
Either the bed's temperature sensor circuit is broken, so the printer reads nothing and never asks for heat, or the sensor is fine and the mains-side heating supply to the bed has failed
Electronics & Firmware 2026-09-01 - Bambu Lab A1 Mini
Print stops part-way and the printer reports 'The nozzle temperature is abnormal, the sensor may be open circuit' with HMS code 0300-0200-0001-0007
An open circuit somewhere in the hotend's NTC temperature-sensor path — far more often a connector that has backed part-way out of the toolhead board than a genuinely failed sensor
Electronics & Firmware 2026-08-23 - Bambu Lab A1
Printer shows 'printing' state in the app and on the display with no job running; won't accept new jobs until power-cycled
Stale print-job state left behind after an interrupted job or dropped cloud connection — the previous job's status is never cleared
Electronics & Firmware 2026-07-01
Categories covered
Electronics & Firmware
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