Not sure this is worded right. A chronometer is watch that has been certified by a Swiss organization to keep time within a set +/- seconds per day in several positions and temperatures.
A chronograph on the other hand is a watch that has push buttons on the side for starting/stopping/resetting a set of hands to mark time elapsed.
If this is truly about a chronometer not starting it is either a broken part or needs cleaning.
If it is about the chronometer not starting most likely if it is a mechanical watch the pusher is stuck or broken or a lever is out of place or bent. If the whole watch does not run then it could be a broken mainspring.
If it is a quartz chronometer it could be a bad battery or if the battery has been changed it is most likely the person that changed the battery has damaged one of the coils and or circuit.
A qualified watchmaker can help with any of these problems.
Hope this helps,
Ken Kotoski
Yellowstone Watch Inc.
www.yellowstonewatch.com
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