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desperately need help-new toilet makes hissing noise every 15 minutes

28 days ago

A brand new toilet in brand new house is making hissing sound every a few minutes. The builder’s plumber replaced the fill valve, didn’t fix it, replaced the tank, still didn’t work, replaced with fluid master fill valve, it improved, the time increased from a few minutes to 15 minutes. But the noise is still there. The plumber doesn’t know what to do. What could be the issue? Should we replace the toilet bowl? Could that be the problem of plumbing valve on the wall? It’s very annoying since it’s connecting to the bedroom and can be heard day and night. Appreciate any help!

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Cumberland Custom Homes
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Northern Virginia's Green Residential Builder & Renovator