262                                                                                                                     Keysight N9938-90003 User’s Guide
System Settings
Understanding the Fan Controls
Fan Error Messages
The FieldFox displays fan error messages, when the fan is not functioning 
properly. Refer to Figure 9-11, Figure 9-12 on page 263, and Figure 9-13 on 
page 263. 
Figure 9-11  Initial Fan Stuck Error Message – Displays For a Few Seconds
If the FieldFox displays a "Fan Stuck" or "Error: Internal Fan has stopped 
spinning" message, to avoid incorrect measurements and possibly 
damaging your FieldFox, shut your FieldFox down and contact Keysight. 
Refer to “Contacting Keysight” on page 5.
If the FieldFox displays a "Fan: Service" message the fan needs replacing. 
Call Keysight and request a fan kit. Refer to Figure 9-13 on page 263 and 
to “Contacting Keysight” on page 5 .