My I70s is networked to my NMEA200 system. While stationary the I70s, ES128 and ES127 all read normal water temperature, to darn cold but normal for a Lake Michigan this time of year. However while under way the I70s will read a water temperature of 29.2 degrees Celsius. All other functions including engine parameters read normally. Any thoughts? I have a depth and speed transducer connected through an ITC5 block and a chirp transducer connect directly to the ES128. I use the ITC5 for speed and depth and the chirp for a visual of bottom contouring.
Welcome to the Raymarine Forum Sadey,
Please click
here to view a FAQ addressing temperature source prioritization within systems featuring more than one water temperature sensing device. In this case, it would appear that their is either a fault within the instrument transducer's thermistor or within the iTC-5's circuitry. When the problem is observed, check the resistance of the thermistor and compare it with the information found
here. If no problem is determined with the transducer's thermistor, then it would be recommended that the iTC-5 be sent to
Raymarine’s Product Repair Center to be bench checked / serviced.