I just installed a Samsung Air Conditioner in my room. It is Samsung AR12KCFQCWQ 1.5Hp Split Air Conditioner. After installation, the temperature of the Air conditioner moved from 34 degrees to 28 degrees and stopped moving even though I've set it to cool mode at 17 degrees. Its been at 28 degrees for about 2 hours now. Please help me out. What's wrong and what should I do?