If you remove the six screws from the top of the dial and lift it out you will find a spider gasket in the base of the valve. This is probally your problem. If you pull this out and clean and dry the base you can spread some silicone on a new one and put back in place. Then replace the top and leave for a couple of hours and that should fix your problem.
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If you remove the six screws from the top of the dial and lift it out you will find a spider gasket in the base of the valve. This is probally your problem. If you pull this out and clean and dry the base you can spread some silicone on a new one and put back in place. Then replace the top and leave for a couple of hours and that should fix your problem.