--- title: "Bertazzoni S1 flashing: KMC charcoal filter is due" description: "What S1 flashing means on Bertazzoni S1 flashing: KMC charcoal filter is dues, what to check before booking, and when it is not a failure at all." url: "https://rangehooderepair.center/error-codes/bertazzoni-s1-flashing/" --- # Bertazzoni S1 flashing: KMC charcoal filter is due When the charcoal alarm has been switched on, the KMC hood counts toward 200 working hours. ## What S1 flashing actually means. When the charcoal alarm has been switched on, the KMC hood counts toward 200 working hours. At that point S1 flashes to say the charcoal filter must be changed and the grease filters washed as well. Bertazzoni range hood display · also shown as S1 LED blinking What to do when S1 flashing shows on the range hood ### Kind of code Filter reminders The hood has counted enough hours of fan time to ask for its filters: the mesh or baffle grease filters want a wash, or on a recirculating hood the charcoal filters want replacing. Most hoods count hours rather than measure grease, so the light comes on whether the filters are clean or not, and it stays on until it is reset with the key the manual names. A reminder that returns straight after a reset, or a hood that still pulls weakly with fresh filters, is worth a visit. ### Usually leads to Range hood filter and baffle service Cleaning or replacing what catches grease and odor: mesh and baffle filters, charcoal pads on recirculating hoods, and the grease channel. ### 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 Bertazzoni A Bertazzoni range hood that has stopped pulling steam is inspected in your kitchen, beginning with the rating label hidden behind its grease filters. ### Source Bertazzoni KMC30X 30-inch canopy hood installation, use and care manual Bertazzoni KMC30X, KMC36X and KMC48X canopy hoods, recirculating setup. ## Before you book, in this order. Each step comes from Bertazzoni's own guidance for S1 flashing on its range hoods. Follow it to the end: the last card says whether this is a visit. 01 Wash the grease filters. 02 Fit a new charcoal filter; it cannot be cleaned or regenerated. 03 With lights and blower off, hold T3 for about three seconds until S1 flashes three times. 04 If the flashing does not stop after the reset, book a visit. ### Still there? It usually turns into [range hood filter and baffle service](https://rangehooderepair.center/services/range-hood-filter-and-baffle-service/). Book with the code and the model number. ### What not to do A flashing S1 appears only if the charcoal alarm was switched on with T4, which is meant for recirculating installations. A steady S1 is the shorter grease-filter reminder. ## What you may notice with it. The range hood problems S1 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 Runs but Barely Pulls Smoke**](https://rangehooderepair.center/problems/range-hood-weak-suction/) Problem ### Reading a Range Hood Error Code or Blinking Light 7 causes, cheapest first Where S1 flashing usually leads ## Range hood filter and baffle service. **Mesh or baffle filters, charcoal pads and the grease channel · lowest.** Book a visit [What the job involves](https://rangehooderepair.center/services/range-hood-filter-and-baffle-service/) ## Bertazzoni range hoods. A Bertazzoni range hood that has stopped pulling steam is inspected in your kitchen, beginning with the rating label hidden behind its grease filters. [Bertazzoni range hood repair](https://rangehooderepair.center/brands/bertazzoni/) More Bertazzoni codes [F](https://rangehooderepair.center/error-codes/bertazzoni-f/) [C F](https://rangehooderepair.center/error-codes/bertazzoni-c-f/) [C](https://rangehooderepair.center/error-codes/bertazzoni-c/) [4](https://rangehooderepair.center/error-codes/bertazzoni-4/) [A key flashing every 2 seconds](https://rangehooderepair.center/error-codes/bertazzoni-a-slow/) [A key flashing every 0.5 seconds](https://rangehooderepair.center/error-codes/bertazzoni-a-fast/) [F and C keys flashing](https://rangehooderepair.center/error-codes/bertazzoni-f-c-keys/) [S1 steady](https://rangehooderepair.center/error-codes/bertazzoni-s1/) [T4 flashing](https://rangehooderepair.center/error-codes/bertazzoni-t4-flashing/) [T2 flashing](https://rangehooderepair.center/error-codes/bertazzoni-t2-flashing/) [T1 flashing](https://rangehooderepair.center/error-codes/bertazzoni-t1-flashing/) [Light B flashing](https://rangehooderepair.center/error-codes/bertazzoni-b-light-flashing/) [All 14 Bertazzoni codes](https://rangehooderepair.center/error-codes/#codes-bertazzoni) Filter reminders on other makes [BEST Fan LED bar flashes slowly for 30 seconds after the fan is turned off](https://rangehooderepair.center/error-codes/best-fan-led-bar-flashing-after-off/) [BlueStar Timer icon blinking, blower off](https://rangehooderepair.center/error-codes/bluestar-timer-icon-fan-off/) [Bosch clean grease filter](https://rangehooderepair.center/error-codes/bosch-clean-grease-filter/) [Dacor Low button blinking](https://rangehooderepair.center/error-codes/dacor-low-button-blinking/) [Elica Grease Filter](https://rangehooderepair.center/error-codes/elica-grease-filter/) [Faber Filter alarm LED on (steady)](https://rangehooderepair.center/error-codes/faber-filter-alarm-led-on/) [Falmec Red LED steady on with the fan off](https://rangehooderepair.center/error-codes/falmec-red-led-steady/) [Fisher & Paykel Filter button lit](https://rangehooderepair.center/error-codes/fisher-and-paykel-filter-button-lit/) [All 55 codes of this kind](https://rangehooderepair.center/error-codes/#family-filter) Bertazzoni 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. Bertazzoni 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. Bertazzoni builds this ### Island range hood The hood that hangs from the ceiling over burners set into a kitchen island, open on all four sides, with its duct and wiring hidden inside a chimney that drops from above. ## In Bertazzoni's own words > The Activated Charcoal Filter saturation alarm comes into operation after the Hood has been working for 200 hours. [Bertazzoni KMC30X 30-inch canopy hood installation, use and care manual](https://us.bertazzoni.com/downloads/7977/4374/libr.KMC30X.pdf?act=download) [Bertazzoni KMC30X 30-inch canopy hood installation, use and care manual](https://us.bertazzoni.com/downloads/7977/4374/libr.KMC30X.pdf?act=download) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Bertazzoni KMC30X, KMC36X and KMC48X canopy hoods, recirculating setup. ## Bertazzoni S1 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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Wash the grease filters. If it comes back, it needs a visit. ### My Bertazzoni hood vents outside. Why does S1 flash? The charcoal alarm is switched on. With the loads off, hold T4 for at least five seconds; the four LEDs flash once to show it is off. ### How do I switch the charcoal reminder on for a recirculating Bertazzoni? With the lights and blower off, hold T4 for about two seconds; the four key lights flash twice to confirm. ### Do I need to wash the grease filters when S1 flashes? Yes. Bertazzoni asks for the grease filters to be washed along with the charcoal change. --- **[Read on the site: Bertazzoni S1 flashing: KMC charcoal filter is due](https://rangehooderepair.center/error-codes/bertazzoni-s1-flashing/)** **[Book a visit with RangeHoodeRepair.center](https://rangehooderepair.center/schedule/)**