Greetings. I had my bathroom gutted and remodeled almost two years ago. While I purchased the new tub and sink from the local plumber who did the installation, I researched here and online elsewhere about the best low-flow toilet I could get. My old toilet was a 3.5 gal. I chose the Toto Guinevere which I ordered online and had shipped to me. I was quite satisfied with this toilet and until now it has given me no issues.
Some people have complained about the tinkling and dripping sounds it makes for several minutes after each use. This has never bothered me, and in fact, it is because of this dripping noise that I discovered just today that a problem is brewing.
Earlier, after not having used the toilet in awhile, it suddenly began making the dripping noise. It didn't stop. The water level in the bowl remained full. I took the lid off of the tank and saw that water was slowly streaming from the black refill tube into the overflow pipe. It was like a very fast trickle but not quite a full stream. I flushed the toilet. The tank refilled and the water coming from the refill tube had completely stopped.
About 15 minutes later, I heard the dripping noises again. I again removed the tank lid. This time the refill line was not dripping at all, but the water level in the tank had slowly risen and was going slowly over the overflow pipe. Hence the same result but from a different method.
I flushed the toilet again. The tank refilled and stopped where it normally does, about an inch or so below the top of the overflow pipe. But about 15 minutes later, the water level in the tank had risen again. For now I have the water line to the toilet shut off.
Anyone have any idea as to what it is that is going bad inside my tank?