Last night at about 1am, I heard running water that sounded similar to a washing machine filling up with water. I ran into my bathroom and saw water overflowing from the toilet tank (not bowl). I immediately shut off the water valve behind the toilet and took off the toilet lid. The fill valve had completely broken off at the base! I flushed the toilet to try to empty the tank, but the water was still coming up to the tank even though the stop valve was turned off; I could also still hear water loudly flowing through to the tank. The only way I could get the water to stop was to turn off the main cold water valve to the entire condo.
I have not done much toilet repair at all, but am I correct in thinking that the issue here is the stop valve? I initially thought it was a surge in water pressure, but now I am wondering if something simply failed in the valve, which caused the surge in pressure which broke off the full valve? The fact that I can't fully turn off water to the tank by using the stop valve alone seems to be an indication of the main problem.
Another possibly unrelated problem (or maybe related??) is when I turn off the main cold water to the condo, my shower hot water trickles out. A friend told me it could be a mixing valve issue, but up until today, we haven't had much problem with hot/warm water in our shower. Others in my building have had mixing valve issues.
I am in a condo that is about 10 years old so I know I am going to have to start replacing things! Just would like to know what and to see if I can do it myself.