--- title: "Microwave-hood vent repair" description: "KitchenAid microwave-hood vent repair — one appliance doing two jobs. When the microwave above your cooktop is also your ventilation, a fan that will not…" url: "https://kitchenaidmiami.support/services/microwave-hood-vent-repair/" date_modified: "2026-08-23" Appliance type: "Microwaves, Range hoods and vents" --- # KitchenAid microwave-hood vent repair ### Two appliances, one box The microwave-hood combination is an over-the-range microwave sold as a ventilation product, and it is the reason the microwave page and the hood page on this site point at each other. Everything about the extraction — the blower, the damper, the filters, the speed control, the lights over your cooktop — lives inside the microwave, which is what decides who should be looking at it. ### What actually goes wrong - **Grease filters**, loaded, which is maintenance rather than failure. - **Charcoal filters**, exhausted, on a recirculating installation. - **The vent fan motor**, usually noisy long before it stops. - **The damper**, stuck shut on a ducted run. - **The control board**, on a fan or a light that will not switch off. ### Filters are the part you can own Roughly monthly for the grease filters if you cook most days, and most of them go in the dishwasher — check yours does before you find out. Charcoal filters are replaced rather than washed. Doing both makes a measurable difference to how well the appliance pulls and how hard its motor is working. ### What it costs From $175. The exact cost is confirmed after the on-site diagnostic and agreed with you before anything is ordered. What this involves Vent fan, damper and speed control tested as one system Ducted and recirculating installations diagnosed differently Charcoal and grease filters checked before the blower is blamed Establish which appliance you actually have A microwave-hood combination is sold as ventilation and repaired as a microwave. If yours is one, the blower, its motor and its controls are inside the microwave and a hood technician is looking at the wrong appliance. Filters before blower Grease filters strangle the airflow when they load, and a recirculating installation also has a charcoal filter that cannot be washed and has to be replaced. A hood that has stopped clearing smoke is very often a charcoal filter nobody knew existed. Test the fan on every speed A blower that works on high and not on low is the speed control rather than the motor. One that hums and does not turn is the motor or something fouling it. The damper and the duct On a ducted installation a damper that sticks shut undoes the whole appliance, and a long run with several bends costs real airflow. Worth knowing before a motor is ordered. Two appliances, one box The microwave-hood combination is an over-the-range microwave sold as a ventilation product, and it is the reason the microwave page and the hood page on this site point at each other. Everything about the extraction — the blower, the damper, the filters, the speed control, the lights over your cooktop — lives inside the microwave, which is what decides who should be looking at it. What actually goes wrong Grease filters, loaded, which is maintenance rather than failure. Charcoal filters, exhausted, on a recirculating installation. The vent fan motor, usually noisy long before it stops. The damper, stuck shut on a ducted run. The control board, on a fan or a light that will not switch off. Filters are the part you can own Roughly monthly for the grease filters if you cook most days, and most of them go in the dishwasher — check yours does before you find out. Charcoal filters are replaced rather than washed. Doing both makes a measurable difference to how well the appliance pulls and how hard its motor is working. What it costs From $175. The exact cost is confirmed after the on-site diagnostic and agreed with you before anything is ordered. ### The fan will not switch off. On a microwave-hood combination that is a microwave call rather than a hood call, because the fan belongs to the microwave. It is usually the control board or a thermal sensor telling it the cooktop below is still hot — which it will do honestly for a while after cooking, and dishonestly for ever if the sensor has failed. ### My microwave died and now I have no ventilation either. That is the trade-off of a combination unit and it is worth planning around. Replacing one means matching a specific width and mounting, which is a large part of why repairing a fitted unit often makes more sense than replacing it. ### How do I know whether mine vents outside or recirculates? If there is a charcoal filter in it, it recirculates — it cleans the air and returns it to the room. Those filters are consumable and get forgotten, and a recirculating hood with an exhausted one has effectively stopped working while still sounding perfectly healthy. ### What does this cost? From $175, with filters and a damper at the low end and a blower motor or a control board above. The exact cost is confirmed after the on-site diagnostic. --- **[Read full article: Microwave-hood vent repair](https://kitchenaidmiami.support/services/microwave-hood-vent-repair/)**