I have a Obi 202 with a Freeze Alarm attached. The Freeze Alarm answers when I call in, but when I enter my PIN, there's no response from the Freeze Alarm. It's especially odd because it worked last winter with the same set-up. The Freeze Alarm also didn't answer this year, but I just solved that by switching the Obi to a trapizoidal ring (thanks to advice I found on this Forum). Any ideas?