You can usually find the schematic glued to the back of the refrigerator. If it isn't facing outwards, it's glued to the inside of a cover panel. You can also go to 'www.whirlpool.com', click on the 'contact us' button, and use the email screen to get one from the customer service department.
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There are several websites that offer manuals online. One of the better ones is 'kitchen.manualsonline.com'. Try going to Google's search engine, and typing the words
'whirlpool refrigerator manuals' for more selections.