Hello @Petroloss 

Thank you for reaching out to us, please try to factory reset the HS100 by pressing the ' Settings' button on HS100 for more than 5 sec

Confirm the wall outlet has power : How to reset TP-Link Kasa smart switch and plug?

If still the same, that could be a faulty plug, you could contact retailer or local support to check device warranty. Hope this helps~