My refrigerator donot turn off?

Dear Sir/Madam,

I have a kelvinator refrigerator KAV 400. A few days ago strange thing happens. The power doesn’t go off, it works continually. The cooling system seems ok. I was forced to pull the plug from the wall and put it back after, to give the compressor some rest.

What do you think the problem is? Is any part of the fridge malfunctioning? Plese give your best advice on how to fix it.

Thank you for all your efforts in advance.

Matusala T. Kifle