I have the Davis Vantage Pro2 ISS with 24 hour Aspirated Fan and Radiation Shield (model 6323). I've had it since 10/2017.
Yesterday, I noticed that my humidity reading was WAY off compared to readings from other stations. I'm still using the Vantage Vue console so I checked how to calibrate the humidity -- which as you know is used to compute the Dew Point. I made the adjustment (which was huge), but today things still seem very much out of sync.
Do I need to replace the sensor? I took the unit apart for cleaning and saw that the sensor is pretty deep inside. It did not look corroded or damaged -- but that's no indication that it's functioning properly.
Is this a common issue after a few years of use?
Thanks,
-gene