I recently purchased a Frigidaire dishwasher and I have received conflicting information on the installation. I have been told by Frigidaire that the drain hose needs to be looped over the top of the dishwasher but the installer said that this wasn't necessary since he installed an airgap on top of the sink. The dishwasher is only a month old and I am having problems with water seeping through at the top of the dishwasher when it is not running. Does anyone know how this should be installed and if so could the installation be causing my problem?

Clarify what you mean by "water seeping through at the top when it is not running".

The installation sounds OK.

Stew