The fan motor will be synchronous - no brushes - the chances are that the bearings are gummed up with fluff. You might consider accessing the blower assembly and giving it a squirt of light oil WD40 perhaps.
A fan motor assembly for £146 is robbery - you can buy an electric fan heater for under £20 - case - blower and element combined. WD40 will cost you about £6 saving £140...
Good Luck...
February 2016
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