I wasn't sure whether to ask here or in appliances, but this is the last thing in the kitchen.

We tried finishing installing this thing last night. Of course the cabinet and countertop was fabricated with these measurements in mind and are all cut to fit it, so I'm stuck with the thing whether it works or not.

It goes up and down, but no fan comes on. It is all plugged in, and on "high".

We don't have the vent hose attached yet, as it is going under the house, and wanted to be sure the thing works before climbing around in the crawl space & cutting holes in brick. Will that matter? As in the fan coming on part?

It is, as the moment, a point of rare relationship strife, so I want it dealt with as soon as possible.