Despite my very efforts, including (but not limited to) countless climbs up the roof yesterday, both wind speed and wind direction sensors refused to operate. Set of spare ones won't work either. However, tipping rain gauge plugged into a "wind" socket shows some wind on a display, so more than likely transmitter's okay.
Anyway, I am tired of endless problems with FineOffset (and their clones) stations, so will leave it as it is, until it dies.
The conclusion - if you want a trouble, buy yourself FineOffset or it's rebranded clone station! Lots of swearing guaranteed!