Toilet flush when no one is in bathroom Home › Forums › Public Forums › General Plumbing › Toilet flush when no one is in bathroom This topic has 1 reply, 2 voices, and was last updated 21 years, 7 months ago by robertgf. Viewing 1 reply thread Author Posts 26 Sep 2002 at 3:49 pm #275802 bob My toilet makes a flushing sound when notin use. What could this be? Please help resolve this mistery. Thanks inadvancePam 28 Sep 2002 at 3:01 am #292915 robertgfParticipant the flapper is worn out and letting water out of the tank Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In