Fridges - usually the model number will be printed on a sticker in the top inner part of the fridge (left or right) - open your refrigerator and look for a sticker with the word model or MOD.
Dishwashers - usually the model number will be printed on a sticker on the top left or right side of the door, in some models you will find the sticker in the inner part of the unit's frame near the door seal - open your unit and look for a sticker with the word model or MOD.
Ovens/Ranges - with most ranges you will find the model number on a sticker on the left or right side of the frame behind the lower storage drawer, open the drawer and look for a sticker with the word model or MOD. In many wall ovens, the sticker with the model number will be on the frame, just open the door and look for it.
Washers - front and top load models- simply open the door and look for a sticker with the word model or MOD, in some older models, the sticker will be behind the control panel (top-loads only).
Dryers - simply open the door and look for a sticker with the word model or MOD.
Cooktops - in most cooktops the model number will be printed on a sticker under the unit. Simply open the cabinet, take a look under and look for a sticker with the word model or MOD.