Extruder stopped working after maintenance

Hi, a bad batch of filament jammed my P1S extruder, so I’ve taken it apart, replaced the hot end assembly and the extruder gear. Unfortunately, it won’t restart and I’ve no idea what I’ve done wrong. The only clue is this warning message:
HMS: 0300-0300-0001-0001

Any advice would be gratefully appreciated.

wiring conector badly conected

next time using WIKI