Hello, I have been given a whirlpool frost free refrigerator. I do not have the manual for it. The numbers found on the fridge must be the wrong numbers as I cannot find a manual to match it. It has a beep after the door is open for a minute. Which is normal. However it has started beeping as soon as the door is opened. I would like to know what this means please.. It is a different type of beep to the normal one.. Hope fully you can help me. Sharyn.