Freezer beeping?

My freezer has been bleeping away all morning.
I have 3 signs at the top. Starting from the left i have an snow flake sign, then a read outlined traingle with a horizontal line through it- which is bleeping and flashing up red...? (driving me crazy) and a circle with a horizontal line through it, which is lighting up green- which obviously means its on.

Amy
June 2010