Depth display showing three dashes

[Stuart 28-2]

A few months ago I installed a Hawkeye Depth Trax 2B. I glued the transducer to the hull per their instructions. I seemed to be working fine until a few days ago and now it just shows three dashes instead of the depth. The only thing the Hawkeye instructions say to do is remove the transducer and hang it directly in the water to see if it works that way. Does anyone have any suggestions as to what could be wrong?
I have repowered it several times and cleaned the exterior of the hull where the transducer is as best I can without taking the boat out of the water. As it powers up it gives the three audible beeps to indicate it is at least powering up okay.

 

[Loren Beach]

If you do not mind a "SWAG".... Sounds similar to the display on my old Standard Horizon DS back in the 80's. When the bottom would not return a readable signal (deep weeds or mud) or was too deep, it showed two dashed lines.
Your DS may have a problem with hardware (or software). Still under the two year warranty, we hope.

DepthTrax 2B | Boat Mount Depth Finder

The DepthTrax® 2B employs advanced algorithmic programming in its SONAR technology, offering precise depth measurements that are refreshed four times per second, up to a depth of 600 feet. With the availability in both a combination transom-mount / glue-in-hull or a thru-hull transducer, it's...

hawkeyeelectronics.com

 

[Frank Langer]

I would check all the wiring connections between the transducer and display again to ensure none had come loose. If it still doesn't show correct depth I would phone the tech people at the manufacturer.
Good luck, I hope it works again soon.
Frank