--- title: "Zephyr C flashing: replace the charcoal filters on a recirculating hood" description: "What C means on Zephyr C flashing: replace the charcoal filters on a recirculating hoods, what to check before booking, and when it is not a failure at all." url: "https://rangehooderepair.center/error-codes/zephyr-c/" --- # Zephyr C flashing: replace the charcoal filters on a recirculating hood When a Zephyr is installed without a duct to the outside, charcoal filters clean the air before it returns to the kitchen. ## What C actually means. When a Zephyr is installed without a duct to the outside, charcoal filters clean the air before it returns to the kitchen. The recirculating reminder has to be switched on, after which the control counts 120 hours and flashes C. Charcoal cannot be washed, so the filters are replaced. Zephyr range hood display · also shown as flashing C, charcoal filter change reminder What to do when C 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 Zephyr Zephyr hoods with unresponsive touch controls, dim lamps or a fan that drifts on without being asked are checked at your home. ### Source Zephyr Firenze (ZFI-M90S) use, care and installation guide Zephyr Essentials Firenze touch control, with the reminder enabled by holding a button 5 seconds while the hood is off. ## Before you book, in this order. Each step comes from Zephyr's own guidance for C on its range hoods. Follow it to the end: the last card says whether this is a visit. 01 Order the charcoal filter listed in your manual and fit it once the hood is off and cool. 02 Do not wash or dishwasher the old charcoal filters; Zephyr says they must be replaced. 03 With the hood off, hold the button for about 5 seconds until C leaves the display to start a new 120-hour cycle. 04 If your hood is ducted outside and C keeps appearing, the recirculating reminder was switched on by mistake; your manual shows how to switch it off. ### 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 C is not a clogged duct or a blower problem, and a ducted hood does not need charcoal at all. The mesh grease filters have their own reminder, the flashing F. ## What you may notice with it. The range hood problems C 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 C 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/) ## Zephyr range hoods. Zephyr hoods with unresponsive touch controls, dim lamps or a fan that drifts on without being asked are checked at your home. [Zephyr range hood repair](https://rangehooderepair.center/brands/zephyr/) More Zephyr codes [F](https://rangehooderepair.center/error-codes/zephyr-f/) [A then 1](https://rangehooderepair.center/error-codes/zephyr-a1/) [CLEAN GREASE FILTERS HOLD FAN- TO RESET](https://rangehooderepair.center/error-codes/zephyr-clean-grease-filters-hold-fan-to-reset/) [FAN- button slowly blinking](https://rangehooderepair.center/error-codes/zephyr-fan-minus-blinking/) [Clean filters indicator on or flashing](https://rangehooderepair.center/error-codes/zephyr-clean-filters-indicator/) [Filter button slowly blinking (30 or 120 hours)](https://rangehooderepair.center/error-codes/zephyr-filter-button-slowly-blinking/) [ACT 390](https://rangehooderepair.center/error-codes/zephyr-act-390/) [PAIRING](https://rangehooderepair.center/error-codes/zephyr-pairing/) [HELLO](https://rangehooderepair.center/error-codes/zephyr-hello/) [Filter clean icon blinking](https://rangehooderepair.center/error-codes/zephyr-lift-filter-icon-blinking/) [Dot flashing in the lower right of the display](https://rangehooderepair.center/error-codes/zephyr-dot-flashing/) Filter reminders on other makes [Bertazzoni F](https://rangehooderepair.center/error-codes/bertazzoni-f/) [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/) [All 56 codes of this kind](https://rangehooderepair.center/error-codes/#family-filter) Zephyr 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. Zephyr 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. Zephyr 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 Zephyr's own words > indicate by a flashing C when charcoal filter replacements are needed. [Zephyr Firenze (ZFI-M90S) use, care and installation guide](https://docs.zephyronline.com/docs/brand_essentials/products/manuals/firenze_manual.pdf) [Zephyr Firenze (ZFI-M90S) use, care and installation guide](https://docs.zephyronline.com/docs/brand_essentials/products/manuals/firenze_manual.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Zephyr Essentials Firenze touch control, with the reminder enabled by holding a button 5 seconds while the hood is off. ## Zephyr C 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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Order the charcoal filter listed in your manual and fit it once the hood is off and cool. If it comes back, it needs a visit. ### Can I clean Zephyr charcoal filters instead of replacing them? No. Zephyr says the charcoal filters should never be cleaned or put in a dishwasher; they are replaced. ### Why does my ducted Zephyr ask for charcoal filters? The recirculating reminder is a setting. If it was turned on at installation, the hood counts toward C even though no charcoal is fitted. ### How often will the C come back on my Zephyr? After every 120 hours of fan use once the reminder is reset. --- **[Read on the site: Zephyr C flashing: replace the charcoal filters on a recirculating hood](https://rangehooderepair.center/error-codes/zephyr-c/)** **[Book a visit with RangeHoodeRepair.center](https://rangehooderepair.center/schedule/)**