--- title: "Cooktop Fan Runs Constantly: Causes and Fixes" description: "The cooling fan under an induction or touch-control cooktop keeps running long after cooking, or a downdraft blower will not shut off or retract." url: "https://cooktoprepair.center/problems/cooktop-fan-runs-constantly/" --- # Cooktop Fan Runs Constantly The cooling fan under an induction or touch-control cooktop keeps running long after cooking, or a downdraft blower will not shut off or retract. ## What it usually means. Two different fans can live under a cooktop. Induction and many touch models have a cooling fan that moves air across the electronics; it runs during cooking and for several minutes afterward until the board cools. Downdraft cooktops add a blower that pulls smoke down through a vent at the back or center and out through a duct in the floor or an outside wall. A cooling fan that never rests points to a temperature sensor or board that believes it is hot, or to electronics that really are running hot because the air path is blocked. A downdraft that runs on points to its switch, its control, or on pop-up models the limit switch that reports the vent is down. The 6 causes, cheapest first Answer these first 01 Is it the cooling fan under an induction top, or the downdraft blower? 02 How long does it run after cooking ends? 03 Is the cabinet below packed, or is a drawer touching the cooktop? 04 Does the pop-up downdraft vent lower all the way? 05 Is the fan also noisy, rattling or grinding? ## Check these before you book. Cooktop fan runs constantly: 5 checks, and none of them costs anything. 01 Give it fifteen minutes after cooking; many cooling fans stop on their own in that time. 02 If the fan comes with a burning smell, or the cooktop feels hot underneath, switch off the breaker. 03 Clear the space under the cooktop and make sure its vent openings are free. ### Also worth checking - On a pop-up downdraft, check that nothing is stopping the vent from lowering fully. - Say whether it is the cooling fan or the downdraft blower when you book. ### How soon does it need a visit? A fan that runs on is rarely urgent. Clear the air path and book a visit if it continues. A burning smell, heat under the counter or a grinding fan is a reason to switch off the breaker. ## The causes, cheapest first. 6 things cooktop fan runs constantly turns out to be, from normal cool-down run to temperature sensor on the board failed. [The cost guide](https://cooktoprepair.center/cost/) 1. 01 no repair ### Normal cool-down run Induction cooling fans keep going for several minutes after the last zone switches off, longest after extended cooking at high power. No repair: check it yourself 2. 02 no repair ### Blocked air path under the counter Items stored against the cooktop's underside, or a missing air gap at the front of the cabinet, trap heat and keep the fan running. No repair: check it yourself 3. 03 low to moderate ### Downdraft switch or control stuck A stuck key or a relay on the downdraft's control keeps the blower going after it has been switched off. [Fixed by cooling fan and downdraft repair](https://cooktoprepair.center/services/cooling-fan-and-downdraft-repair/) 4. 04 low to moderate ### Pop-up vent limit switch Pop-up downdrafts use a switch to sense when the vent is fully lowered. If it is out of line or has failed, the blower runs on or the vent will not go down. [Fixed by cooling fan and downdraft repair](https://cooktoprepair.center/services/cooling-fan-and-downdraft-repair/) 5. 05 low to moderate ### Fan motor slowing with age A cooling fan that turns slowly cannot clear the heat, so it runs longer and louder each time. [Fixed by cooling fan and downdraft repair](https://cooktoprepair.center/services/cooling-fan-and-downdraft-repair/) [See induction cooktop buzzing or clicking](https://cooktoprepair.center/problems/induction-buzzing-or-clicking/) 6. 06 moderate ### Temperature sensor on the board failed The cooling fan follows a sensor near the power electronics. A failed sensor reads hot all the time, and the fan never rests. [Fixed by induction board and coil repair](https://cooktoprepair.center/services/induction-board-and-coil-repair/) [On an induction cooktop](https://cooktoprepair.center/types/induction-cooktop-repair/) ## What else it could be. Most often confused with induction cooktop buzzing or clicking, then induction cooktop not detecting pan. [All problems](https://cooktoprepair.center/problems/) Codes that come with it - [`E8` BlueStar · Cooling fan and downdraft](https://cooktoprepair.center/error-codes/bluestar-e8/) - [`F2` Bosch · Temperature and overheat sensors](https://cooktoprepair.center/error-codes/bosch-f2/) - [`F4` Bosch · Temperature and overheat sensors](https://cooktoprepair.center/error-codes/bosch-f4/) - [`A2` Dacor · Cooling fan and downdraft](https://cooktoprepair.center/error-codes/dacor-a2/) - [`G` Fisher & Paykel · Cooling fan and downdraft](https://cooktoprepair.center/error-codes/fisher-and-paykel-g/) - [`F2` Gaggenau · Temperature and overheat sensors](https://cooktoprepair.center/error-codes/gaggenau-f2/) [17 more codes, by make](https://cooktoprepair.center/error-codes/) Also related - [**Cooktop Error Code** 6 causes](https://cooktoprepair.center/problems/cooktop-error-code/) ### Induction Cooktop Buzzing or Clicking 5 causes ### Induction Cooktop Not Detecting Pan 6 causes Gas, fire, broken glass or live current ### Cooktop Burning Smell 6 causes ## The makes it happens on. 29 makes on this site; cooktop fan runs constantly can show up on any of them. Each mark opens that make's own page. [All 29 brands](https://cooktoprepair.center/brands/) ## Cooktop Fan Runs Constantly, where we come out. 9 metros, each with its own page. 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The fan cools the power electronics, which stay warm after cooking. It stops once they reach a safe temperature, usually within minutes. ### Can I disable the cooling fan? No, and it should not be disabled. The fan protects the electronics; without it they overheat and fail. ### My downdraft vent will not go back down. What should I do? Check for anything blocking the vent, then switch the cooktop off at the breaker for a minute. If it still will not lower, the limit switch or the lift motor needs service. ### Is the downdraft blower the same fan that cools the electronics? No. The downdraft moves cooking smoke out through a duct, while the cooling fan moves air across the boards. They fail differently and are repaired separately. --- **[Read on the site: Cooktop Fan Runs Constantly: Causes and Fixes](https://cooktoprepair.center/problems/cooktop-fan-runs-constantly/)** **[Book a visit with CooktopRepair.center](https://cooktoprepair.center/schedule/)**