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The Gmax valve vibrates a little and you can hear the water running and it runs from 2 to 5 seconds then stops, and in about 5 minutes it will do it again. You cannot see it flushing, you just hear the water running into the top tank. The flapper appears to be tight and no water movement in the toilet bowl.
We had the plumber out and he cleaned the Gmax, but it is still doing it.
You might have a thermal expansion problem or the the valve is bad.
Make sure your pressure in the water system doesn't exceed 80 psi.
Open a faucet just a little bit and let it run. Wait to see if the toilet continues to do the same thing. If it does, replace the Gmax valve. You can use a Fluidmaster 400A. No need to get an expensive Gmax valve.
Posted on Jul 16, 2009
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Posted on Jan 02, 2017
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