The cooking is not even when cooking small items
Often times this isn't something you want to attempt to rectify yourself. If you can find a way to deal with or adjust to this issue it will save you the cost of a repair visit. If the uneven bake is so severe that you cannot cook in the oven and you still wish to attempt repair by yourself you first need to identify which racks aren't cooking correctly and in which pattern is it uneven.
For example is the rack uneven in overall color from top to bottom, meaning are items on the top cooking to quickly where as the items on the bottom are uncooked? Or is the uneveness lateral where the center of a single tray is over/under cooking or the edges of a tray are over/under cooking.
Once you've identified your issues you need to locate your airflow louvers. They are usually located in the back right corner of this oven, it is where the hot air comes out of the heat exchanger chamber. You will notice there are gaps and there are fins. Adjusting the fins changes the way the air flows from side to side across your product, adjusting the gap changes how much hot air reaches the product.
Lets approach side to side uneveness first. To compensate for the center of a tray UNDER cooking take the metal fin lined up with that tray on the RIGHT side and slightly bend it to the left, directing air towards the center of the tray. If the center is over cooking bend it to the right, directing air away from the center of the tray.
For top to bottom uneveness you will need to loose the screws/bolts holding the fins in place and gently increase or decrease the gaps. Be careful here because if you loosen the screws too much the louver can slide out of place and make to large of a gap, potentially making things much worse. A good trick is to take a permanent marker and make a mark to where the louver was before you adjust it incase you need to put it back.
If a single tray is too light in relation to the other trays increase the gap, if it is too dark, decrease the gap. Do this for each tray that is coming out uneven. Make small adjustments and then do a bake to check the results, there may be a lot of trial and error involved.
If this seems overwhelming you're probably better off not attempting this because you can make things worse to the point where NOTHING comes out correctly, if that's the case call your local authorized service provider. Good luck!
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