Old 10-22-19, 10:04 AM
  #12  
Wilfred Laurier
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I suspect that the cable is incorrectly routed, as @trailangel said. This will make the derailleur movement very stiff at the shift lever, but not necessarily lock it. Many front derailleurs have a washer with a tab under the cable pinch bolt, and the cable is supposed to go over the tab, which may be non-intuitive when you are setting it up.

To the OP: did you do any work on the bike before it stopped working? Like adjustments to the derailleur? It is a possibility that the two limit screws are turned in too far. Their job is to stop the derailleur from moving past the inner and outer chainrings, and if they are turned in to far they can stop the derailleur moving almost completely.
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