Electric cooker , oven Fan failure or noise, testing winding and inspecting rotor and replacement

Sometime the fan stop working or it can make loud noises due to motor damage , bearing failure or warping of the fan blades. The only way to find out is to dismantle and inspect the whole fan assembly.

I started out by removing the back cover and locating the motor for the fan, i then tested the motor for continuity within the motor field windings and this being a good motor and fan unit the reading were good , if you get OL then the windings have failed so you need to replace these.

Unfortunately the locking nut on the fan blade was too tight under normal circumstances i would if cut the rotor in half with a grinder, hack saw or reciprocating saw and replace but seeing as this is a good unit i decided to leave it in place not good for this post but best i could do.

I just removed the winding if you winding are damaged and you rotor fits exactly into replacement then you could consider just replacing this piece and leaving the rotor and fan blades as they are.

If the winding is damaged this can cause a loud motor due to in correct magnetic fields causing poor running.

Buy cooker and oven spares from Ebay UK here 

Buy a good Multimeter here on Ebay UK 

Read the Electric cooker repair book here on Amazon UK 

locate fan and you may need to pull up the connector or remove completely 

Buy Multimeter here 

connect the multimeter and select ohms continuity reading 

here i remove the fan and element cover to access the fan blades

I tried a spanner and socket but could not get the retaining bolt to budge 

even tried wd40 and leverage but it was not budging , usually i would cut the nut off with a 

grinder but this is a good unit so did not want to damage it 

instead you could dismantle from the rear and either cut rotor in half or 

just replace the winding if that is all the is faulty .

undoing screws and below the rear rotor mount and bearing assembly 

you can see rotor here now and winding will pull free 

here is the fan motor winding you could just unplug the connectors

and replace this unit on its own 

Above is rotor assembly 

and below i start the process of refitting the winding

and the motor housing 

tightening up the rear rotor mount and bearing

and then below the motor housing retaining screws

see below for video of this process