I bought a house and moved in last week. It is a traditional Cape with a 1st floor full bathroom and a 1/2 bath in the basement with a washer and dryer in the same room. For some reason the basement toilet overflows (for no apparent reason). Water just begins to pour out of the seat/basin. I have had the main line snaked twice out to the road (I am on city water/sewer). The drain guys tell me that there is no blockage and don't know what is causing this overflow. I have had a plumber replace the old toilet with a new one, and fully examine the situation. He couldn't figure it out. I have run everything in the house to try and force it to overflow while the plumber was there (washing machine, kitchen sink, dish washer, flushed upstairs toilet) but we were unable to recreate the situation. Everything will be fine (nothing will be running in the house), then the toilet will just flood/overflow for no reason.
I have a finished basement, and I am getting to the point that I am afraid to leave the house. Does anyone have any ideas as to what could be causing this? Thanks for your help.
Regards,
Josh