From the Samsung Online FAQ for my RF266AASH
Can I Use the Water Dispenser Without a Water Filter?
The water and ice dispensers will work without an AquaPure water filter installed.
The water filter housings are designed as rotary valves that allow the water
to bypass the water filter whenever there is no filter or the filter is not
in the lock position.
Models designed for use with the AquaPure water filter are shipped
with a cap in place to cover the opening and keep it free of debris prior to
the installation of the water filter. It is not necessary to have this
cap in place for the unit to bypass the water nor is it intended to plug the
housing to prevent leaks.
Note: This does not apply to the Quatro Convertible models. The filter
must be installed on this model.
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