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Two months ago I took the fan motor off the top of my boiler and replaced the upper bearing with a high temperature sealed bearing. I could not replace the lower one without removing the whole fan unit from the exhaust manifold - a job for the professionals. And if you've gone that far you might...

Thanks Agile, if the new bearing makes no difference I'll get the fan changed by a professional. Why should all those fans fail after only two - three years? Could it be that the wrong bearings were fitted in the first place? they should be deep-grooved high temperature bearings. I'm finding...

My FF 260 is 13 years old and has just started to do the same thing. Thanks to Les I'm going to try replacing the bearing first, in case that works. If I have to replace the fan after all, should I fit new gasket 'rope' to the exhaust collector on top of the heat exchanger while I'm at it...