Siemens porsche kettle om switch problem
Some switches are called momentary and others are the click on and click off type.
It could be a problem with the switch if is is the click on type.
It could be a relay that "seals in" when you press the on off switch to on.
By "seal in" I mean, the kettle is wired so that when the relay coil energizes, it closes a contact when it is electrified and becomes an electric magnet and the energy that was going through the on off button, is now going through the closed contact on the relay.
If you don't here a clicking sound like you used to, it could be a fuse inside inside of the electrical box on or by the kettle.
I don't know by the information, if this is a household small appliance or commercial?
Even if household, it should have the same basic setup.
This may be of some help to you
What About The Kettle?
Despite being metal the kettle is cool touch (a tough special grade plastic interior). A good safety feature is that the kettle will only switch on when the lid is closed, there is a special lid release button. The kettle also has automatic overheat protection. Of course the kettle is cordless and has cord storage in its base. Water quality? Well, it's better if you use filtered water, but with this kettle it is even better - it has a removable stainless steel limescale filter in the spout!