Anyone who bakes for a crowd will notice a tired convection fan sooner than anyone else, and the HBL87M53UC suits exactly that kind of cook. This 800 Series combination oven has a microwave plus multi-rack convection compartment on top, a full oven below, Home Connect, and a 7,975 watt rating.
Multi-rack convection is Bosch’s way of baking on several shelves at once. A slowed fan can still brown one tray reasonably well, but it cannot keep three shelves even, so uneven results across racks are often the first clue a baker gets that the fan is tiring.
Two more items come up on this model. Grease builds up behind the rear baffle and chokes airflow, and the microwave interlocks wear when the door is opened often. The unit fits a 49 inch column and uses touch control. We test the fan speed first, then clean behind the baffle.
Most likely the convection fan has slowed, or the rear baffle is clogged with grease. Either cuts airflow, and baking on many racks is where that shortfall appears first.
Often. A convection fan typically turns noisy or sluggish before it stops completely, so it is better to look into it early than to work around it with longer bake times.
It can, when grease is what restricts the airflow. We test the fan speed first, then clean behind the baffle, so you never pay for a part you do not need.
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