¶ What it is
HMS_0500_0300_0001_0002: The toolhead is malfunctioning. Please restart the device.
The HMS message happens when AP detects the tool head module malfunctioning.
¶ When to use
- communication between the AP and the MC board is abnormal
- communication between the MC and the TH board is abnormal
When this issue happens, all operations related to MC will malfunction, such as:
- set the temperature of hot end
- the extruder does not work
¶ Operation guide
Check the communication between the AP and TH board, including AP→MC, MC→TH.
¶ X1:
Replacing the toolhead TH board assembly | Bambu Lab Wiki
Replacing the AP board / Application Board | Bambu Lab Wiki
USB-C Cable Connection Issue | Bambu Lab Wiki
¶ P1
Toolhead cable | Bambu Lab Wiki
PCBs on the toolhead of P1P | Bambu Lab Wiki
MC-AP cable installation tutorial
AP board installation tutorial
For P1, please also check whether the seat of the tool head cable is soldered. Please contact our after-sales service if the seat is floating and falsely welded.
The MC-TH connector is directional, so please ensure the socket is inserted correctly. If inserted in reverse, it will cause a power short circuit, resulting in the printer reporting an HMS error or inability to power on properly.
