All wiring
Off
On, heating up
On, at temp
Brewing espresso
Steam, heating up
Steam, at temp
Pumping hot water
Overheated
Modification for PID
Dual Setpoint PID
Advanced Dual Setpoint PID
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Once the steam temperature is reached, the steam thermostat opens and stops the flow of electricity through the heating element. Note that at this point the only thing powered is the lamp in the steam switch and the lamp in the power switch.