Hi, This is my first post, I'm hoping some of you guys can help me.... My boiler has just gone on the blink. It just stopped lighting and it makes a loud whirring noise. I removed the cover and I can see the fan isn't spinning. So , I tried to spin the fan with my hand and it's really stiff, "the bearings" I thought. Removed the fan but once it's removed the fan moves freely. If I turn on the boiler without the fan connected there's no whirring but of course the boiler doesn't light. So, can I test the fan? I just want to put a current across it and see what it's doing but I'm not sure about the best way to do that. Is it possible for the motor to be ****ed in such a way that when it's on it'll try to alternately spin one way and then the other? resulting in a loud whirring and no movement? I'm really hoping it's just the fan as they are only £40 on ebay.... HELP!