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This started a few weeks ago in the spare bath room, I replaced all internal parts in tank and problem still present. The main bath which is closer to main water source operates fine, what could be my problem?

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The only possible cause is a slow leak. There could be leaks in several places:

  • Flapper valve: Did you replace the flapper? Did you clean the flapper valve seat? Run your finger all the way around it to feel for deposits and nicks. Repair with light use of sandpaper.

  • Tank bolts: These fasten the tank to the bowl unit. If these were to leak, most toilets would weep water over the backside of the bowl housing onto the floor. Check for moisture back there and all around on the floor. Some toilets can weep here but direct water into the bowl. The only way to discover this is by taking the bolts out and checking whether the bolt head seals are in good condition.

  • Inlet seal: Where the water enters the tank from underneath is another area where gaskets prevent water from exiting the tank and weeping down the water line. Check for moisture here.

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  • I did replace the tank bolts and seals as well as the inlet seal. I will check the flapper valve and hopefully that's the culprit. Thank You!
    – randy
    Commented Sep 23, 2013 at 17:08

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