The fan is used to circulate the air inside the oven cavity, this evens out the temperature all round the oven cavity , which id in the cooking process reduces heat and energy needed.
Commonly the motors used are shaded pole motors which are single phase AC induction motors simple but reliable motors.
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Common issues
A visual inspection will show if grease or food or other materials build up inside the mechanism or other things getting caught up in the rotor blades can all be common issues, these can slow the motor down and even create overheating in the motor and eventual breakdown.
To test the motor winding you will need to set your multimeter to ohms and test between the two motor winding terminals. 70-110 ohms is usually the range to expect , you can also test the motor winding to earth and insulation resistance test if required.
You can also do a visual inspection of the motor to look for damage or burning discolouring in the windings.
Its always wise to spin the blades as well to make sure they are not rubbing or making contact to anything which will cause a lot of noise when the fan kicks in.
See video below for checking over, testing and possible noise solutions below
Cooling fans are used to cool the chassis of the oven so that any parts that are exposed to the touch are kept cool via cool air from the room and safe to touch. Cooling fans look different but the motors are usually the same type of shaded pole motor.
To test the motor winding you will need to set your multimeter to ohms and test between the two motor winding terminals. 80-150 ohms is usually the range to expect , you can also test the motor winding to earth and insulation resistance test if required. Visually inspect fan operation.
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