Originally Posted by gracey
Can you help. Someone used my RV in the cold and run water into the sink thus triggering the safety valve so water will drain straight to the ground instead of holding tank so pipes will not break. Can you please tell me how it looks it was at the bottom of the seat close to the bathroom. Had the same problem years ago and flipping it resolved it
Gracey - you should have started a new thread instead of coming into the end of someone else's thread.
I can not think of any safety valve that would cause your problem. Sounds more like they left the gray tank discharge valve open or may have gone over a high curb and broke some thing.
One word of advise is to never let anyone borrow your RV.