--- title: "Zephyr ACT 390, ACT 590 or ACT OFF: the installer's airflow cap" description: "What ACT 390 means on Zephyr ACT 390, ACT 590 or ACT OFF: the installer's airflow caps, what to check before booking, and when it is not a failure at all." url: "https://rangehooderepair.center/error-codes/zephyr-act-390/" --- # Zephyr ACT 390, ACT 590 or ACT OFF: the installer's airflow cap Airflow Control Technology lets the installer cap a Zephyr hood's top airflow, for example to stay under a make-up air limit. ## What ACT 390 actually means. Airflow Control Technology lets the installer cap a Zephyr hood's top airflow, for example to stay under a make-up air limit. Holding ON/OFF for 3 seconds with the hood off shows ACT 390, ACT 590 or ACT 290 when a cap is active, or ACT OFF when it is not. With a cap on, the hood offers fewer fan speeds. Zephyr range hood display · also shown as ACT 590, ACT 290, ACT OFF What to do when ACT 390 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 Nothing needs fixing; the number is a setting. ### 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 Siena Pro use, care and installation guide Siena Pro and Tornado LCD hoods display it as text; LED-only hoods such as Anzio and Ombra show the cap by how many speed lights come on. ## Before you book, in this order. Each step comes from Zephyr's own guidance for ACT 390 on its range hoods. Follow it to the end: the last card says whether this is a visit. 01 Nothing needs fixing; the number is a setting. 02 If the hood seems to have lost its top speeds, check the ACT readout before assuming the blower is weak. 03 The cap is changed with a jumper on the board inside the hood, so book a visit rather than opening it yourself. ### 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 ACT readings are not error codes or temperatures. A hood that shows ACT OFF and still pulls poorly has a duct, damper or blower issue instead. ## What you may notice with it. The range hood problems ACT 390 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/) - [**Range Hood Fan Stuck on One Speed**](https://rangehooderepair.center/problems/range-hood-stuck-on-one-speed/) 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/) ## 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/) [C](https://rangehooderepair.center/error-codes/zephyr-c/) [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/) [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/) 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 76 codes of this kind](https://rangehooderepair.center/error-codes/#family-mode) 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 > The LCD will display up to three options depending on the settings, "ACT 390", "ACT 590", and "ACT OFF". [Zephyr Siena Pro use, care and installation guide](https://docs.zephyronline.com/docs/manuals/siena_prod_manual.pdf) [Zephyr Siena Pro use, care and installation guide](https://docs.zephyronline.com/docs/manuals/siena_prod_manual.pdf) [Zephyr Tornado II and III use, care and installation guide](https://docs.zephyronline.com/docs/manuals/tornado2a_3a_v2_manual.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Siena Pro and Tornado LCD hoods display it as text; LED-only hoods such as Anzio and Ombra show the cap by how many speed lights come on. ## Zephyr ACT 390 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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Nothing needs fixing; the number is a setting. ### Why does my Zephyr only have four speeds instead of five? ACT is probably enabled. A capped hood drops one or more of its top speeds. ### Can a Zephyr ACT setting be changed later? Yes, by moving a jumper on the board behind the light panel. It is a job for whoever handles your code compliance. ### Where else can I see the Zephyr ACT setting? Zephyr asks installers to stick a foil CFM label inside the hood near the wiring diagram. --- **[Read on the site: Zephyr ACT 390, ACT 590 or ACT OFF: the installer's airflow cap](https://rangehooderepair.center/error-codes/zephyr-act-390/)** **[Book a visit with RangeHoodeRepair.center](https://rangehooderepair.center/schedule/)**