How to mend ... Pressing Turning Knob

My Polti Vaporetto evolution heats up but does not let any steam out?

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Can I buy a replacement cap - as mine has been lost?

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How can i mend it?

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Switch bad?

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My vaporetto is not steaming ?

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Cannot remove cap to fill with water?

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How do I get my Hoover F7226-900 to spray detergent?