1.This is 3.5 bar espresso machine, so it doesn't support too fine grinder, we advice you use the medium size coffee ground, it's the best size coffee ground for this espresso machine!
2.Turn filter holder counter-clockwise until handle locates in the "Lock" position, make sure it's tight. If not, the steam will comes out from the filter holder.
3.Don't pour water into tank immediately after making espresso coffee, wait about 1 minutes at least.
4.Don't open the lid when making espresso coffee.