I am looking for a replacemnet Fan Assembly for a Myson Orion 75Si wall mounted gas boiler GC Appliance No 4149421. The Fan Asembly part number is 309A634.

The boiler is approximately 12 years old.

I am told the part is not available in Dublin and I will not be able to check this until January. Any ideas of where I can get the part in the UK?


I believe the problem is that the bottom bearing on the vertical spindle is worn and sticks. I would swap the top and bottom bearings if I could take the fan apart but cannot remove the lower bushing to detach the fan from the motor.

Paul Graham, paul_graham@ie.ibm.com, December 2006

There is a replacement fan for this model. It is THORN 4430268 FAN ASSY WFFB1202-0081

lofty, January 2010

Hi Paul
Cant be sure on the model but try thesearch on this site they seem to have most fan assemblies, I have been looking for a 60SI and its on there
http://www.gasbits.com/component/page,shop.browse/category_id,5869/option,com_virtuemart/Itemid,32/

Dave, November 2007

If you can get the bearings out then the size you want is a
6mm diameter (shaft size) with an outside diameter of 19mm with a depth of 6mm (from memory)
the bearings can be difficult to remove so if you cant get the part you have nothing to loose.

ex thorn rep 23 years

dave b, April 2007

i've checked a few dealers in uk they all say no longer available.
good luck.

hi-spec plumbing, December 2006