Is the oven currently in use or has a cycle recently completed?
It is normal for all wall ovens to have an automatic cooling fan that runs when the oven is in use and/or after a cycle completes.
It is normal:
For the automatic cooling fan to run when the oven is in use and/or after the cycle completes.
To hear the automatic cooling fan move air when the oven is in use and/or cycle completes.
The automatic cooling fan:
It helps to cool the enclosed oven cavity and the electronic controls when the oven is in use and/or after the cycle completes.
Keeps the electronic controls cool during every oven function such as BAKE, BROIL or CLEAN.
Note: In many wall ovens, if the oven door is left open to cool the oven, the cooling fan will not shut off.
It is not normal for the cooling fan:
To make a rubbing/metal-on-metal noise when operating.