Ford Mondeo Ghia 2002 Electronic Air Conditioning

The above system has 3 controls/dials Left controls fan speed and temperature Right controls where heating goes (Screen, footwell, face level vents,
etc) The middle one is a digital representation for actual temp and other information. Has anyone ever had this middle dial "flash" intermittently? What does it mean - my local Ford dealer has no idea Thanks for any help Glenn Morris (United Kingdom)
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