Troubleshooting Tips

Please refer to the following table to identify and correct some common troubleshooting scenarios.

Possible Cause
Possible Solutions

Display won't turn on

The 1-amp in-line fuse is broken

Replace the 1-amp fuse found near the end of the power cord

No probe data appears on the display

The probe is out of the water

The probe is only on when in the water


The transducer is not mounted correctly on the transom

Locate the transducer in a spot on the transom where prop wash is minimized. Do not locate the transducer near a kicker motor. The transducer should be parallel with the surface of the water at the bottom of the hull.


The GAIN adjustment is set too low

Press the SET button on the display. The default GAIN setting is 15. Use the arrow up key to increase the GAIN. The GAIN may need to be increased in deep water, rough water, or when using downrigger weights less than 15lbs. 


The probe is too close to the boat

The probe needs to be at least 5-feet under the transducer

The probe temperature on the display reads 3.8 - 4.0

The thermistor tubes on the probe have been damaged

Unfortunately there is no way to repair the damage, the probe must be replaced. Prevent by removing the probe from the downrigger cable when not in use.

Probe readings on the display are erratic

Sonar interference 

Set your fish finder to run at 200 kHz rather than 50 kHz or 83 kHz. Separate  transducers on the transom if practical.

Surface and probe readings on the display are erratic

Electrical interference from the boat

Run the power cord directly to the boat battery and not through a fuse panel

The Fish Hawk Display turns on or off when you start the engine

Electrical interference from motor. Common with Mercury outboards produced between 1990 and 2002 

Replace the standard spark plugs with suppressor (resistor) spark plugs