I have a new Kohler toilet. Sometimes after flushing the handle stays down and the closet does not refill because the flapper is in the up position. I thought it was an air pressure problem because when I lift the tank cover, the handle releases and the flapper shuts close. No hardware is being pinched or restricted by the tank lid. If I prop the lid part ways open the handle will not sometimes release. JT
Is there a chance you have an air pocket in the flapper itself... try replacing flapper with a solid black rubber one.... they have more weight to them maybe the lever on the out side of the tank is getting caught up on the bottom of the lid
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Is there a chance you have an air pocket in the flapper itself... try replacing flapper with a solid black rubber one.... they have more weight to them maybe the lever on the out side of the tank is getting caught up on the bottom of the lid