--- title: "JennAir hood display shows C: charcoal filter service" description: "What C means on JennAir hood display shows C: charcoal filter services, what to check before booking, and when it is not a failure at all." url: "https://rangehooderepair.center/error-codes/jennair-c/" --- # JennAir hood display shows C: charcoal filter service A JennAir hood installed to recirculate uses a charcoal filter to strip odors before the air returns to the kitchen. ## What C actually means. A JennAir hood installed to recirculate uses a charcoal filter to strip odors before the air returns to the kitchen. The control tracks fan hours and, at 120, shows C whenever the fan runs. On these hoods the charcoal filter is washed and dried hot to reactivate it, and replaced after about three years. JennAir range hood display 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 JennAir JennAir hoods and downdraft vents are diagnosed at home, with the lift, the blower and the touch controls each tested on the call. ### Source JennAir Product Help: C - Displayed (vent hoods) JennAir's help site lists C for its display vent hoods without naming the models; the charcoal filter on these hoods is expected to last about three years. ## Before you book, in this order. Each step comes from JennAir's own guidance for C on its range hoods. Follow it to the end: the last card says whether this is a visit. 01 Remove the charcoal filter and run it through the dishwasher on the highest temperature with ordinary detergent. 02 Dry it in an oven for 10 minutes at 210°F or less to reactivate it, then reinstall it. 03 Hold FAN for 3 seconds to clear the C. 04 If the hood is ducted outdoors with no charcoal filter, hold + and - together for 3 seconds to disable the alarm; F flashes for 3 seconds to confirm. ### 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 a timer alarm about odor filtering and does not mean the blower is weak or the duct is blocked. It also does not appear on JennAir downdraft vents, which have no display. ## 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/) ## JennAir range hoods. JennAir hoods and downdraft vents are diagnosed at home, with the lift, the blower and the touch controls each tested on the call. [JennAir range hood repair](https://rangehooderepair.center/brands/jennair/) More JennAir codes [F](https://rangehooderepair.center/error-codes/jennair-f/) 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 61 codes of this kind](https://rangehooderepair.center/error-codes/#family-filter) JennAir 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. JennAir 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. JennAir 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 JennAir's own words > After 120 hours of fan operation, the display will show “C” when the fan is active. [JennAir Product Help: C - Displayed (vent hoods)](https://producthelp.jennair.com/Cooking/Ventilation_and_Hoods/Vent_Hoods/Operation/Error_Codes/C_-_Displayed) [JennAir Product Help: C - Displayed (vent hoods)](https://producthelp.jennair.com/Cooking/Ventilation_and_Hoods/Vent_Hoods/Operation/Error_Codes/C_-_Displayed) [JennAir Product Help: C - Displayed (vent hoods)](https://producthelp.jennair.com/Cooking/Ventilation_and_Hoods/Vent_Hoods/Operation/Error_Codes/C_-_Displayed) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. JennAir's help site lists C for its display vent hoods without naming the models; the charcoal filter on these hoods is expected to last about three years. ## JennAir 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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Remove the charcoal filter and run it through the dishwasher on the highest temperature with ordinary detergent. If it comes back, it needs a visit. ### Does C on my JennAir hood mean I must buy a new charcoal filter? Not at each reminder. JennAir has you wash and oven-dry the filter to reactivate it, and replace it after about three years of use. ### How do I switch off the C alarm on a ducted JennAir hood? Hold + and - at the same time for 3 seconds. F shows for 3 seconds to confirm, and the charcoal alarm stays off. ### My JennAir hood shows both F and C. Which comes first? Deal with both at once: wash the grease filters and the charcoal filter, then clear the alarms with a 3-second hold on FAN. --- **[Read on the site: JennAir hood display shows C: charcoal filter service](https://rangehooderepair.center/error-codes/jennair-c/)** **[Book a visit with RangeHoodeRepair.center](https://rangehooderepair.center/schedule/)**