There are some helpful error codes that are displayed in the sea temperature field on the display, and accessible from the NMEA stream, alternatively, the power light indicator will flash to indicate an error.
To take advantage of the codes, you can set a page or panel up to view sea temperature.
WindBot stopped calculating True Wind
Not receiving apparent Wind from Wind Sonic sensor
Not receiving IMU (Compass) data
Not receiving GPS data
Hierarchy: Codes with higher numbers trump those with lower numbers.