--- title: "Smeg two keys flashing: 24-hour air exchange is on" description: "What 24h keys flashing means on Smeg two keys flashing: 24-hour air exchange is ons, what to check before booking, and when it is not a failure at all." url: "https://rangehooderepair.center/error-codes/smeg-24h-flashing/" --- # Smeg two keys flashing: 24-hour air exchange is on The 24h air exchange runs the hood at minimum speed for ten minutes every hour, for up to 24 hours. ## What 24h keys flashing actually means. The 24h air exchange runs the hood at minimum speed for ten minutes every hour, for up to 24 hours. Two keys flash for as long as it is active. Smeg range hood display · also shown as 24h air exchange What to do when 24h keys flashing shows on the range hood ### Kind of code Mode, not a failure The hood is doing something it was told to do, not wearing out: a delay-off timer that keeps the blower running for some minutes after the burners go off, a heat sentry that starts the fan by itself when it senses a hot pan, a Sabbath setting that locks the keys and dims the lights, or a link to the cooking surface that sets the speed on its own. No part is needed; a key sequence from the manual, or simply waiting, ends it. ### Usually leads to No repair Leave it on if you want the kitchen aired through the day. ### Shows up as Reading a Range Hood Error Code or Blinking Light A range hood error code may appear as letters and numbers on a display, a light that blinks in a pattern, a filter reminder that will not clear, or a beep with the fan refusing to start. ### Make Smeg A Smeg hood with a fan that won't start or lamps that won't light is seen in your kitchen, and the visit begins at its switch. ### Source Smeg user interface guide for touch-panel hoods (KBTU) Smeg KBTU touch-panel hoods (guide 91477B656) and KPRU 9-button touch panels (guide 91477A860). ## Before you book, in this order. Each step comes from Smeg's own guidance for 24h keys flashing on its range hoods. Follow it to the end: the last card says whether this is a visit. 01 Leave it on if you want the kitchen aired through the day. 02 Touch any key other than the light key to switch it off. 03 If the fan runs non-stop instead of ten minutes an hour, book a visit. ### Cleared? The code is gone and the blower pulls steam up on every speed again without a new part. If it returns this week, or the filter reminder keeps coming back right after a cleaning, mention it in the booking. ### What not to do The flashing pair is not a filter alarm, which flashes the speed keys. It is not a stuck fan either; the hood rests between runs. ## What you may notice with it. The range hood problems 24h keys flashing tends to arrive with. Answer these at the range hood before anyone is booked. [All problems](https://rangehooderepair.center/problems/) Before you call ### [Reading a Range Hood Error Code or Blinking Light](https://rangehooderepair.center/problems/range-hood-error-code/) [All 7 causes, cheapest first](https://rangehooderepair.center/problems/range-hood-error-code/) It also comes with - [**Range Hood Fan Won't Turn Off**](https://rangehooderepair.center/problems/range-hood-fan-wont-turn-off/) Problem ### Reading a Range Hood Error Code or Blinking Light 7 causes, cheapest first No repair indicated ## Nothing to repair. The hood is doing something it was told to do, not wearing out: a delay-off timer that keeps the blower running for some minutes after the burners go off, a heat sentry that starts the fan by itself when it senses a hot pan, a Sabbath setting that locks the keys and dims the lights, or a link to the cooking surface that sets the speed on its own. No part is needed; a key sequence from the manual, or simply waiting, ends it. [How to read what your range hood is telling you](https://rangehooderepair.center/problems/range-hood-error-code/) ## Smeg range hoods. A Smeg hood with a fan that won't start or lamps that won't light is seen in your kitchen, and the visit begins at its switch. [Smeg range hood repair](https://rangehooderepair.center/brands/smeg/) More Smeg codes [All 4 LEDs blinking](https://rangehooderepair.center/error-codes/smeg-4-leds-blinking/) [Speed keys flashing](https://rangehooderepair.center/error-codes/smeg-speed-keys-flashing/) [LED over a speed key blinking](https://rangehooderepair.center/error-codes/smeg-timer-led-blinking/) [Turbo key flashing](https://rangehooderepair.center/error-codes/smeg-turbo-flashing/) Mode, not a failure on other makes [Bertazzoni C](https://rangehooderepair.center/error-codes/bertazzoni-c/) [BEST Fan LED bar flashes slowly and fan speed cannot be changed](https://rangehooderepair.center/error-codes/best-heat-sentry-fan-light-flashing/) [BlueStar Timer icon blinking, blower running](https://rangehooderepair.center/error-codes/bluestar-timer-icon-fan-on/) [Bosch End](https://rangehooderepair.center/error-codes/bosch-end/) [Café Low, Med and High LEDs rolling blink](https://rangehooderepair.center/error-codes/cafe-low-med-high-rolling-blink/) [Dacor Timer LED blinking](https://rangehooderepair.center/error-codes/dacor-timer-led-blinking/) [Elica Snd](https://rangehooderepair.center/error-codes/elica-snd/) [Faber Intensive speed drops back after 6 or 10 minutes](https://rangehooderepair.center/error-codes/faber-intensive-speed-timer/) [All 78 codes of this kind](https://rangehooderepair.center/error-codes/#family-mode) Smeg builds this ### Wall-mount range hood The chimney hood fixed to a bare stretch of wall above the burners, its canopy catching the rising smoke while a telescoping cover hides the duct that climbs to the ceiling. Smeg builds this ### Under-cabinet range hood The slim hood screwed to the bottom of the wall cabinet over the burners, venting up through that cabinet or back through the wall, or cleaning the air and returning it to the room. Smeg builds this ### Range hood insert The working core of a custom hood: a steel liner or power pack carrying the blower, filters, lights and controls, fitted inside a hood built of wood, plaster or metal by a cabinetmaker. ## In Smeg's own words > To start the 24 hour function, press and hold the button for 3 seconds. [Smeg user interface guide for touch-panel hoods (KBTU)](https://doc.smeg.it/qr/91477B656/EN) [Smeg user interface guide for touch-panel hoods (KBTU)](https://doc.smeg.it/qr/91477B656/EN) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Smeg KBTU touch-panel hoods (guide 91477B656) and KPRU 9-button touch panels (guide 91477A860). ## Smeg 24h keys flashing range hood repair, where we come out. The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered. 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Leave it on if you want the kitchen aired through the day. ### Why does my Smeg hood run for ten minutes every hour? The 24-hour air exchange is on. ### How do I stop it on my Smeg? Briefly touch any key except the light key. ### Does the 24h mode stop by itself on a Smeg? Yes, after a maximum of 24 hours. --- **[Read on the site: Smeg two keys flashing: 24-hour air exchange is on](https://rangehooderepair.center/error-codes/smeg-24h-flashing/)** **[Book a visit with RangeHoodeRepair.center](https://rangehooderepair.center/schedule/)**