My toilet downstairs keeps making a flushiing sound when I am not using it. If I turn the water off - fear of some leak behind the wall - I can hear the flushing sound on the 2nd floor. Do I need to call a plumber?

Hello Leak423'

You have posted your problem on a 4 years old post, start a new post and some one will help you.

Your problem sounds like you have problem with you flapper valve and it is an easy fix, Thanks.

John

Follow Johns advice and check then flapper. Run your hand around the flat part. If you feel any wavy edges or rough spots replace the flapper. If the flapper's OK then run your finger around the seat the flapper sets on. If it's got nicks or rough spots click on back and let us know about it. Good luck, Tom