//inside the app.component.html add (activate):
<router-outlet (activate)="onActivate($event)"></router-outlet>
//inside app.component.ts, add inside the class of the component:
export class AppComponent {
onActivate(event) {
window.scroll(0,0);
//or document.body.scrollTop = 0;
//or document.querySelector('body').scrollTo(0,0)
}
}