That's not ungrammatical. It doesn't jar with me at all as it's just a general information message and isn't referring to any particular fridge.
On a similar note, it's interesting that Americans tend to say "I was taken to the hospital" while we omit the "the".
The beer (ale) at my local 'Spoons is absolutely fine and nearly half the price of my usual local. No complaints here! I don’t dine out there but from what I can see it's in the cheap and cheerful category. If your needs are more refined, go elsewhere.
As for slogans, my bête noire are those...