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Heat up and vent false pressure

Heat up and let the air out

Air left in the boiler gives a "false pressure". The manual lets it out once, at every start.

Fill the boiler to the top mark, between the bottom and top of the sight glass.
Press the switch. It lights up to show the machine is on.
Wait for the indicator light to go off.
Slowly open the steam knob anticlockwise to let out the false pressure, then close it clockwise.
The light comes back on. Wait for it to go off again.
The machine is now at pressure and ready.

The light goes on and off. The manual: that is the pressurestat holding the pressure.
A short hiss from the safety valve as it warms up. Owners put this down to the anti-vacuum part inside the valve closing. After that it should be quiet.
When to close the knob. The anti-vacuum part closes before all the air is out, so owners still vent through the wand. One owner check: hold the tip about 3 cm under water; when the bubbles stop, the air is gone.
The lever rises by itself as the machine cools. The manual: a vacuum is forming in the boiler.