I own one of these and the mapping (GPS) part works great. But for the past couple of trips the sonar works intermittently or not at all. Unit reads 1.3 feet or 1.8 feet, etc when I am in 20 ft of water.
Occasionally it will work correctly, and then back to this 1.4 feet stuff.

When it worked it worked fine. Wiring looks good. Transducer aiming appropriately. Transducer looks fine, no trauma to it that I can see.

Any thoughts on how to fix? I am afraid to call Lowrance after reading on this website how long I will stay on line to get poor customer support...

Thanks.

If it makes you feel better my 334 is doing the same thing. Just started two trips ago. Can't find bottom. I get the same thing as you. I have the newest software update and it worked fine until two Saturday's ago. So if you get an answer please let me know. Perchjerker from this site helped me with my update so maybe he has some clues. Will yours start up with the Lakemaster chip installed. Mine won't since the new update. Have to pull the chip out, start the unit and then re-install.

Anyway, if you get some answers I would enjoy hearing them. I am almost ready to order a new transducer. Although last Saturday in Lake Michigan it didn't work going out and worked fine coming in.

Paul C
Mattawan, MI

I have the same problem with my 332. Sent it in 3 times under warrenty and they still can't figure it out .Also tried new transducer. All summer without a finder is not fun!

Have you tried a soft reset. My 332c gets lost at times and a soft reset works.
On the 332c it's pages and power at the same time, for 5 sec.

I run a Navionics chip, and that works great, as does the GPS...when the internal antenna finds the satellites (this is my last internal antenna...). I have the latest software installed. My impression was that the software was for the GPS, not the sonar anyway, but that might not be true.
I am disappointed to hear that the new transducer did not help you. That is the only possible solution, but I can't see how it could have gone bad.
Anyway, I guess when you hear me say that I am not marking fish, it does not mean they are not there! Unless I hear a plausible solution, I guess I will be looking to go to a new brand of sonar...

I will give it a try...it cannot hurt!

Thanks!

I've tried soft reset and the hard reset.

I have the same issues with my 334. I own 2 334's. I switched the ducer to my other unit and same problem. I have a new ducer I will try. Lowrance support suggested my 2 year old brand new never used ducer may be defective only because of age.? Soft restart did not help.

Try what some of us in the know have done. Switch to Humminbird. You'll never regret the change, and support is unbelievable. The entire lowrance 332/334 line was a disaster for Lowrance. the product was pulled as it never worked properly.

bit the bullet, bought a new transducer and now the unit works.
Hopefully this solution lasts for a few years.
Thanks to all for their help.