Consult the Common Checks guide and make sure that all categories are fully verified
No Temperature Reading Shown
Check your unit
* Before trying the following suggestions, turn your depth sounder on without using any options or selections to see if the problem may be in the way the depth sounder was set up to operate. Turn all features on Auto and/or set all options to "Restore Defaults" using the Setup Menu tab. If possible, check your depth sounder on a friend’s boat that has the same type of depth sounder and model number and the appropriate temperature gauge. This will indicate whether the problem is with the depth sounder or with the accessories, cables and/or installation. If the depth sounder still has the same problem on your friend’s boat, return it along with a letter explaining the problem in detail. If the depth sounder works correctly on your friend’s boat, proceed with the appropriate suggestions below. Make sure your depth sounder is capable of reading Water Temperature. This will be shown in your Operations Manual.
* NOTE: The temperature sensor may be built into the transducer that came with your depth sounder.
* Make sure that all necessary accessories are connected to the depth sounder. Check the Accessory test screen of the System Status screen. The built in temp of a transducer will show as Temperature and if you have added an extra or auxillary temp probe, this will show up as Aux. Temperature. You will want one or both of them to show as Connected.
* It is possible to configure some depth sounders so that no temperature information is displayed even though a temperature gauge is functioning properly. You can also go out to the Select Readouts menu from your Set Up tab to make sure you have selected temperature to display in one of your Readout location.
Incorrect Temperature Reading
Not all Humminbird depth sounders measure water temperature. Refer to the Operations Manual that came with your depth sounder for water temperature gauge options. If your depth sounder has a temperature gauge, and the reading are inaccurate, there are several things you should check. NOTE: the temperature sensor may be built into the transducer that came with your depth sounder.
Check the Unit
If your depth sounder has a Temp. Offset menu, you can use this to adjust the temperature readout of the temperature sensor to match other temperature gauges on your boat. You also want to make sure that the if you have a menu option to Hide Temp that it has not been
Check All Accessories
If an accessory is not connected, or not connected properly, it could alter the temperature reading. Refer to the Operations Manual for correct installation of accessories.
Check the Mounting Location
* If the Temperature Sensor on your temperature accessory is mounted on the motor of a trolling motor or close to the water discharge of your main motor, this may cause the temperature readings to be incorrect. Try remounting your temperature sensor some place that the water in the immediate vicinity is not artificially heated or cooled by the boat or any equipment on the boat.
* If the temperature sensor is built into the transducer and it is installed inside the hull of your boat, you will not get accurate water temperature readings.
Check F vs. C
If your depth sounder reads both Fahrenheit (F) and Celsius (C), the problem could be that the depth sounder is reading the wrong temperature measurement. In this case, refer to your Operations Manual to select the proper temperature units. On some fishfinders, the temperature units are determined by the depth units. Select the temperature by selecting the depth units. If you cannot select the temperature units, send your fishfinder to the address shown at the end of this document along with a letter explaining the temperature/depth units you would like the depth sounder to read in. Only products purchased through your authorized International Distributor will read in Celsius.
Customer Resource Center
If you are still having problems after trying the preceding suggestions, return your depth sounder along with the power cable, transducer(s) and any accessories (switches, temp, speed, etc.) and a letter with a detailed description of your problems to:
Johnson Outdoors Marine Electronics
Service Department
678 Humminbird Lane
Eufaula, AL 36027
(800) 633-1468 Customer Resource Center
email: service@humminbird.com