Since you said it worked correctly on another transducer, I think your issue may be with your transducer. Occasionally the connection entering the transducer will crack or leak water in frying the unit.
Replacing it will most likely resolve the issue.
Capt. Craig Copeland
Licensed by the US Coast Guard
2013 Nautic Star 2110 Shallow Bay Boat
Humminbird HELIX 12 CHIRP MEGA SI GPS G2N
Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)