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Lowrance 3500 Digital Depth Guage flashed 0.5 continuously

Our in dash Lowrance 3500 Digital Depth Guage flashed 0.5 continuously.
Occasionally it will actually work. Butmost of the time just flashes the 0.5. I have cleaned the bottom of the boat where the puck shoots thru the hull. No change. Any help in fixing this is appreciated.

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  • 76 Answers

If you have a glue in style transducer, be sure that the fluid has not leaked out of the cup. Otherwise, there really is no effective way to troubleshoot those without having known good parts to swap and try. If the cup is empty, it will need to be resealed with silicone (100% silicone) and then refilled with mineral oil.

Posted on Sep 03, 2009


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Posted on Jan 02, 2017


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X510c most of the time it reads 1.6 for the depth, it flashes 1.6 then it will go to the correct depth for a shqrt time then get stuck on 1.6 again some times other depths but mostly 1.6

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The X510c will have problems keeping depth in shallow water...especially if it is muddy, weedy down there.

If the problem occurs even in depth over 20ft, then try resetting the unit:

1. Turn unit off
2. Press and hold ZIN, ZOUT, and PWR until you see the depth (flashing or not) in the top left corner.

If the problem still occurs, make sure the transducer is clean and still mounted so that it is sending the signal straight down to the bottom.

If the problem still occurs, make sure the power is good. You can have the voltage displayed on the screen through the overlay data menu.

Does the problem occur at any speed? If the problem clears up when you stop or slow down, the problem is due to cavitation and the transducer will need to be moved to a location where it is in a smooth flow of water at all speeds.

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Other than that you can have the X510c returned to the factory for service.

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