If your GWF7 or VWF7 filtration system is leaking
Is the unit perfectly level ? if not, the float might not be rising properly.
Is there anything in the reservoir which might interfere with the normal functioning of the float ? For example, ice, or loose parts floating in the water ?
On dispensers with a flat roof, have you removed the bottle support ring from the top of the unit ? If not, your filtration system may be sitting too high to let the float engage.
On dispensers with a sloping roof, leave the bottle support ring in place, but remove the bottle cap piercing valve from the center, as it can interfere with the function of the float.
Have you just recently changed filter ? There may be some carbon particles in the lower chamber which are stopping the float from sealing. Check for carbon dust.
If you have had your filtration system for a year or more, there may be some minerals attached to the silicone seal on the float, preventing it from sealing tightly. If so, a new float may be obtained from Customer Service.
If your VBF6 system is leaking, ensure that both the filter and the refill cap are firmly in place. Do not over-tighten.