Furuno fi-304 Instruction De Maintenance

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2. Speed and distance functions: No reading [ --- ]
  C13 should be ON. See 5.1.2
  Check that setting C72 is according to your installation.
  Check that the impeller is rotating easy and freely i.e. is free from vegetation
  Check that there is no remaining anti fouling paint inside the through-hull fitting.
6.2.3 
Error messages
The following messages may appear on the display:
ERR 2
Nexus Network is missing, check colour coded connections
ERR 3
No Network data received within a given time.
ERR 10
Range error caused by incorrectly entered value, e.g. 430°.
ERR 11
Remote command that can not be performed.
ERR 17
Too small magnetic variation.
ERR 18
Busy with Autodeviation
ERR 19
Autodeviation check error, repeat again.
If other messages than the above appears on the Compass Data instrument, contact
your FI-30 dealer.