dimplex heater not heating?

i have a small dimplex storeage heater in our bathroom which has now stopped heating,it was in error covered up with a towel,so it would appear that the overload cut out has worked, however on stripping the front panel off the heater, i found that a connection with two terminals on top of the heater, one of the connection was disconnected by a raised narrow part which i tried to put down , however it just keeps jumping up again, the model is dimplex XL6N-6KWH