Anyone know how to reset an eagle fishmark 320? I think. Mine always has temp flashing and 32 degrees. I hooked it up to the transducer on my trolling motor and the one that came with it both same results.

I know how to re-set a Eagle 240, not sure the 340 is the same?

Press-Menu & hold
Press-Power & hold
Test menu will appear on the screen.
Let Menu and Power buttons up.
Press Exit, something else will appear on screen.
Press- Exit again
Turn unit off and restart, should be re-set.

Let me know if that works, the temp. still might not work after re-set, mine only work about half the time, no matter what I do to it.