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Polti Vaporetto steam cleaner- can't stop flow of steam from machine?

Hi, my steamer has developed a fault where it just steams continuously and the only way to stop the steam is to turn down steam control to low and switch it off. As it loses pressure the steam reduces. This is really dangerous. The fault appears to be in the main machine, not the hose, as the steam isn't being controlled where you attach hose to machine.

Polti Vaporetto VT Edition Steam Cleaner

spik and span
January 2018

Polti Polti VT Edition Household Appliances, Steam Cleaners Polti Vaporetto Cleaner

In short I did this:

Add 3 vials of calstop in tank
Heat up machine
Keep pressing the hose steam control button on and off to let the calstop run through the solenoid valve

spik and span
August 2018

UPDATE

I suspected that the solenoid valve was stuck open (my steamer had been in storage for a while). I used extra calstop in tank during use. Later I was just using the on/off button on the hose and noticed the clicking noise on the machine appeared to get louder. I kept switching the steam control on and off and eventually the solenoid valve became unstuck and I could control the steam with the on and off button. Yippee

spik and span
August 2018