Fish Hawk Triducer

[rapala]

I just installed another fish hawk triducer on boat, Reason for 2 is: Starboard triducer is close to my Honda 9.9 and I believe I get interfence from the bubbles from prop.

I had a spare Used triducer, so I installed it on port side. I know the unit works ok with the original probe, starboard side, temps and speed top and bottom ok.

After hooking it up on port side , I get a reading of top speed and no temp. It says

ER-R ----on temp, but will register the speed when I spin the triducer. Wondering if I need a new triducer. I haven.t been able to try out on lake to see if the bottom speed and temp works. I do get the speed to work by putting in bucket of water under triducer. Any help will be appreciated.

Bill