Here are the diagrams and repair parts for Official Craftsman 6643 automatic timer, as well as links to manuals and error code tables, if available.
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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.
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#NI
All parts diagram
Part #156T1978-A
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Part #156EB1945-A
The manufacturer no longer makes this part, and there's no substitute part
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