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[* black] Disconnect the spade connectors from the digital switch near the steam valve knob.
- [* icon_note] When you open the steam valve knob (to steam your milk), a cam attached to its shaft closes the digital switch which in turn starts the pump to ensure an adequate supply of water reaches the boiler.
+ [* icon_note] When you open the steam valve knob (to steam your milk), a cam attached to its shaft presses the digital switch, closing the circuit. This either starts the pump, gives power to the heater, or both, to produce steam (we don't have a circuit schematic).