My hotpoint ultima condenser dryer won't dry my clothes the heating light comes on for 5 minutes and the clothes get hot then the light goes off and no heat if you bang the front of the machine the light flickers on and off I have replaced the thermostats at the back any help would be appreciated

How old is the drier, and does it get a lot of use. How many are in your family using this drier? DrTom4444