compressor has a ploblem hight temprature 220 celsius degree

My compressor is ZT 18/37. And it has a ploblem about hight temprature: temprature sensor in pulsation damper show: up to 220 celsius degree pressure : up to 7.8bar but i setting max air compressor at 8bar, and i cheched check valve, cleared intercooler and aftercooler, cleared pulsation damper and changed oil filter, air filter. So they OK. help me!. Thanks you duonglq, hochiminh city