Timer Not Working

I Own A Maytag Washer Model # Mat10csaaw. On Oct. 19th I Placed An Order For A Timer Part # Ap249879 (22001086). The Part Was Finally Delivered On Dec. 4. The Old And The New Timer Look Exactly The Same As Do Their Part Numbers. After Installation The Washer Would Only Stay On One Cycle (any Cycle That Was Depressed). Along Further Investigation I Noticed The Timer Itself Was Not Running. Do I Have A Faulty Part? What Should I Do?