--- title: "BEST hood running on HIGH by itself with a blinking fan light: Heat Sentry" description: "What Fan LED bar flashes slowly and fan speed cannot be changed means on BEST hood running on HIGH by itself with a blinking fan light: Heat Sentrys, what to…" url: "https://rangehooderepair.center/error-codes/best-heat-sentry-fan-light-flashing/" --- # BEST hood running on HIGH by itself with a blinking fan light: Heat Sentry BEST hoods carry a Heat Sentry thermostat above the cooking surface. ## What Fan LED bar flashes slowly and fan speed cannot be changed actually means. BEST hoods carry a Heat Sentry thermostat above the cooking surface. When it senses excessive heat it starts the blower on HIGH if it was off, or raises it to HIGH if it was lower, and while it is in charge the fan light flashes slowly and the speed cannot be changed. The blower goes back to your setting when the temperature falls. BEST range hood display · also shown as Heat Sentry, fan key backlight flashing slowly while running, blower comes on by itself on HIGH What to do when Fan LED bar flashes slowly and fan speed cannot be changed 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 Check the burners: if a pan is on fire, turn the burner off, slide a lid over the pan and leave it, never use water, and get out and call 911 if flames reach the hood or the cabinets. ### 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 BEST BEST hood inserts and chimney hoods get a visit that traces the airflow from the filters up to wherever the blower is mounted. ### Source BEST HBN3 series built-in hood installation, use and care guide Described in the HBN1, HBN3, HBN5 and HBN65 built-in guides and the WCS1, WCP1 and WCT1 chimney hood guide. The WPP1 chimney hood shows Heat Sentry differently, with speed 4 flashing. ## Before you book, in this order. Each step comes from BEST's own guidance for Fan LED bar flashes slowly and fan speed cannot be changed on its range hoods. Follow it to the end: the last card says whether this is a visit. 01 Check the burners: if a pan is on fire, turn the burner off, slide a lid over the pan and leave it, never use water, and get out and call 911 if flames reach the hood or the cabinets. 02 If there is no fire, turn the heat down and let the blower run; it returns to your setting once the area cools. 03 BEST warns the fan key cannot stop the blower during Heat Sentry; if you must stop it, use the main power switch behind the filters only when it is safe to reach, or the breaker. 04 If the hood goes into Heat Sentry with nothing hot below it, book a visit to test the thermostat. ### 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 A slow blink while the blower is running on HIGH is Heat Sentry, not the filter reminder, which only blinks after the fan has been turned off. It is also not a stuck keypad, because the keys come back as soon as the heat drops. ## What you may notice with it. The range hood problems Fan LED bar flashes slowly and fan speed cannot be changed 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/) - [**Range Hood Fan Stuck on One Speed**](https://rangehooderepair.center/problems/range-hood-stuck-on-one-speed/) - [**Range Hood Buttons or Keypad Not Responding**](https://rangehooderepair.center/problems/range-hood-controls-not-responding/) - [**Grease Fire Under or Inside a Range Hood**](https://rangehooderepair.center/problems/range-hood-grease-fire/) 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/) ## BEST range hoods. BEST hood inserts and chimney hoods get a visit that traces the airflow from the filters up to wherever the blower is mounted. [BEST range hood repair](https://rangehooderepair.center/brands/best/) More BEST codes [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/) [All 4 blower speed lights flash for 30 seconds](https://rangehooderepair.center/error-codes/best-four-speed-lights-flashing/) [Speed 4 button flashing, speed 3 lit](https://rangehooderepair.center/error-codes/best-speed-4-flashing/) [Calibration button light blinks continuously](https://rangehooderepair.center/error-codes/best-calibration-light-blinking/) [Speed indicator LED flashing after pressing delay-off](https://rangehooderepair.center/error-codes/best-speed-light-flashing-delay-off/) [WiFi LED flashing](https://rangehooderepair.center/error-codes/best-wifi-led-flashing/) Mode, not a failure on other makes [Bertazzoni C](https://rangehooderepair.center/error-codes/bertazzoni-c/) [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/) [Falmec TIMER (red LED flashing)](https://rangehooderepair.center/error-codes/falmec-red-led-flashing/) [All 77 codes of this kind](https://rangehooderepair.center/error-codes/#family-mode) BEST 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. BEST 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. BEST 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 BEST's own words > When Heat Sentry is activated, the fan LED bar flashes slowly and the fan speed cannot be changed. [BEST HBN3 series built-in hood installation, use and care guide](https://bestrangehoods.com/api/media/file/HBN3%20Install%20Guide-0cb4607b-c42f-4f5d-bfc3-c5e629205406.pdf) [BEST HBN3 series built-in hood installation, use and care guide](https://bestrangehoods.com/api/media/file/HBN3%20Install%20Guide-0cb4607b-c42f-4f5d-bfc3-c5e629205406.pdf) [BEST HBN3 series built-in hood installation, use and care guide](https://bestrangehoods.com/api/media/file/HBN3%20Install%20Guide-0cb4607b-c42f-4f5d-bfc3-c5e629205406.pdf) [BEST HBN1 series powerpack insert quick start manual](https://bestrangehoods.com/api/media/file/Installation_Guide_HBN1_Trilingual-f249a805-adcf-44ce-87a7-d0e5ebaeb610.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Described in the HBN1, HBN3, HBN5 and HBN65 built-in guides and the WCS1, WCP1 and WCT1 chimney hood guide. The WPP1 chimney hood shows Heat Sentry differently, with speed 4 flashing. ## BEST Fan LED bar flashes slowly and fan speed cannot be changed 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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Check the burners: if a pan is on fire, turn the burner off, slide a lid over the pan and leave it, never use water, and get out and call 911 if flames reach the hood or the cabinets. ### Why did my BEST hood turn itself on? Heat Sentry can start the blower on HIGH even when the hood is off, if it senses excessive heat above the cooking surface. It is a safety feature and it hands control back once things cool. ### Why won't the fan key turn off my BEST hood? During Heat Sentry the keys are locked out on purpose. Let the heat come down, or cut power at the main switch behind the filters or at the breaker if you must stop it. ### Is Heat Sentry the same as SmartSense on a BEST hood? No. SmartSense is the Auto mode you choose, which adjusts the fan to the heat of your cooking; Heat Sentry is a thermostat that takes over on its own when the heat is excessive. --- **[Read on the site: BEST hood running on HIGH by itself with a blinking fan light: Heat Sentry](https://rangehooderepair.center/error-codes/best-heat-sentry-fan-light-flashing/)** **[Book a visit with RangeHoodeRepair.center](https://rangehooderepair.center/schedule/)**