HMS 0300-1800-0001-0001: extruder eddy current sensor frequency too low
The machine cannot see the nozzle. Usually the nozzle is genuinely missing or seated wrong, not a broken sensor.
Category: Error codes
Machine error codes explained: Bambu HMS codes, MINTEMP and MAXTEMP, thermal runaway, homing and probe failures. What the code means, and what to check first.
HMS 0700-2000-0002-0009: AMS slot failed to extrude
The AMS pushed filament but the extruder never picked it up. The handover point between AMS and toolhead is where this usually breaks.
HMS 0300-0900-0002-0003: extruder extruding abnormally
Filament is moving but not at the rate the firmware expects. Slipping gears and undersized filament are the usual causes.
HMS 0300-0900-0002-0001: extrusion motor overloaded
The extruder is pushing against something that will not move. Work the filament path from the spool inwards before you reset anything.