It's a longshot, but check that the batteries are good and seated properly, and that the red LED transmitter light is blinking steadily every 10 seconds.
Otherwise, I'd contact Acurite.
To speed things along, tell them you've tried fresh name-brand batteries (e.g. Duracell) and that hasn't helped. That should speed you through the first part of their debugging script.
I've been trying to disassemble the anemometer section of my beta unit tonight to see how it works, but I haven't figured how to do that without being destructive.