Fish Hawk 840

[sovaa4307]

Got it before we started fishing this year, worked the first few trips and now i either get the dashed lines, or exagerated data. for example it said i was in 17* water the other day, and then it jumped to 97*. I've noticed out of the water, if i wipe the transducer with a rag, i get a realistic reading from the probe, but then seconds later its gone. Any ideas on what to do?

[SeaCatMich]

How old is the 9v battery in the probe? Even with alkalines I usually had to replace it every 2-3 days of use. When it gets low you get intermittent/weird readings.

[sovaa4307]

How old is the 9v battery in the probe? Even with alkalines I usually had to replace it every 2-3 days of use. When it gets low you get intermittent/weird readings.

I tried new ones. I went through a whole pack thinking that that could be it, but did the same thing. So unless each battery was bad im thinking thats not it.