Marine Electronics Questions? Ask a Technician for Answers ASAP
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I would advise you to check the connector between the two devices (the chartplotter and the transducer) if either one is in 'Used' condition (as opposed to when both are quite new.)
Open the connector, brush both sides of the connection with a clean dry brush for at least 20 seconds, then wipe down both sides of the connection with a clean dry rag cloth, and re-connect firmly.
After that, if the transducer is new and it is not being put in to replace another transducer that didn't appear to be working, then you may have a defective transducer, quite simply, and need to return it as such promptly to the vendor or store that you bought it from, for an exchange or refund.