electric fire?

Hi.I cant find a name on my electric fire,bought 2nd hand with surround.It has 3 bars 13 1/4 inch.there was a screeching noise coming from the front fan,it also has a back fan.oiled both but it still screeched.took the end stud off the lower fan which i think is rubber with a metal bit inside,oiled it,still screeched.reversed the little metal washer thing and it is now silent but stops spinning after a few minutes.I am frightened to use the fire in case it is dangerous if the lower fan is not spinning.