Product category topic: Clothes dryer; Refrigerator Click to see full answer. Hereof, what year was my dishwasher made? First, Locate the Serial Number To find out the year your dishwasher was made, you first need to find its serial number. Inside the door or on the side panel of your dishwasher, you will find strings of numbers and letters hopefully still legible after years of use. how old is my appliance by serial number? To determine the age of your appliance, use your serial number (not model number) to find date of manufacture. Our serial numbers begin with two letters followed by six numbers. The 2 letters at the beginning of the serial number tell you the month and year it was made. Accordingly, how old is my Frigidaire dishwasher? How to find the age of your Frigidaire appliance. Frigidaire makes White/Westinghouse, Tappan, Frigidaire, Kelvinator. You will need to find your serial/model tag and record the numbers and letters on this, then look at your serial number and work out the age like so. LA84501552 = year, this could be 1988 or 1998.Where is the manufacture date on appliances?Locate the model and serial number label on the appliance. Look on the back of a washer or dryer for the paper label. On a freezer or refrigerator, the label may be located on the inside, either on the liner or on the side of the door. Check the model and serial number label for the manufacturing date.