--- title: "Range Hood Fan Stuck on One Speed: Causes and Fixes" description: "A range hood stuck on one speed runs only on high, or only on low, or ignores the speed buttons after it starts, and sometimes jumps to full power by itself…" url: "https://rangehooderepair.center/problems/range-hood-stuck-on-one-speed/" --- # Range Hood Fan Stuck on One Speed A range hood stuck on one speed runs only on high, or only on low, or ignores the speed buttons after it starts, and sometimes jumps to full power by itself when the burners are on. ## What it usually means. Hood blowers usually run at several fixed speeds, set by switching the motor to different windings or by a board that drives it at different levels. A mechanical switch has a contact for each speed; an electronic hood uses a relay or a solid-state output on the board for each. When one of those contacts or outputs fails, the fan keeps only the speeds that still work. A motor with a burned winding can lose one speed too. Some behavior is by design: a heat sensor can push the fan to high when the canopy gets hot, a boost mode runs full power for a few minutes and then drops back, and some hoods remember the last speed after a power cut. A fan that runs on high and ignores the other settings may be one of those, or a board output stuck on. Most of this is sorted with the manual and a breaker reset, and the rest on a visit, without anyone reaching up into the canopy or the chimney cover. The 6 causes, cheapest first Answer these first 01 Which speed works, and which ones do not? 02 Does the fan jump to high by itself when the burners are hot? 03 Is there a boost or intensive mode that runs for a set time? 04 Are the controls mechanical switches or a keypad? 05 Does the fan sound normal on the speed that works, or strained? ## Check these before you book. Range hood stuck on one speed: 5 checks, and none of them costs anything. 01 Once the burners have been off a while and the canopy is cool, step through the speeds again. 02 Check the manual for a boost or intensive mode and how long it runs before dropping back. 03 Reset the board with the breaker off for five minutes, then try each speed. ### Also worth checking - Note which speeds work and whether the fan sounds normal on them. - Book a visit with the model number from behind the filters and which speeds respond. ### How soon does it need a visit? Not urgent; the hood can be used on the speed that works. A burning smell, a hum without the fan turning, or a fan that cannot be stopped moves this to those pages. ## The causes, cheapest first. 6 things range hood fan stuck on one speed turns out to be, from heat sensor or boost mode running high to a winding in the motor burned out. [The cost guide](https://rangehooderepair.center/cost/) 1. 01 no repair ### Heat sensor or boost mode running high A heat sensor pushes the fan to high when the canopy gets hot, and a boost mode runs full power for a while before dropping back. The manual shows both and how long they last. No repair: check it yourself 2. 02 low to moderate ### A worn speed switch contact On mechanical controls, the contact for one speed wears or fills with grease. The switch is replaced. [Fixed by range hood fan switch and control repair](https://rangehooderepair.center/services/range-hood-fan-switch-and-control-repair/) 3. 03 low to moderate ### A heat sensor reading high A sensor that reads hot when it is not holds the fan on high and ignores the lower speeds. [Fixed by range hood heat sensor repair](https://rangehooderepair.center/services/range-hood-heat-sensor-repair/) 4. 04 low to moderate ### A capacitor that weakened A weak capacitor can let the motor start on high but not hold the lower speeds. A new capacitor often restores them. [Fixed by range hood blower motor repair](https://rangehooderepair.center/services/range-hood-blower-motor-repair/) 5. 05 moderate ### A relay or output failed on the board On electronic hoods, each speed has its own output. When one fails, that speed goes dead or stays on. [Fixed by range hood control board repair](https://rangehooderepair.center/services/range-hood-control-board-repair/) 6. 06 moderate to highest ### A winding in the motor burned out Multi-speed motors have a winding or tap per speed. When one opens, that speed stops and the others may still run; the motor is replaced. [Fixed by range hood blower motor repair](https://rangehooderepair.center/services/range-hood-blower-motor-repair/) ## What else it could be. Most often confused with range hood fan won't turn off, then range hood buttons or keypad not responding. [All problems](https://rangehooderepair.center/problems/) Codes that come with it - [`4` Bertazzoni · Mode, not a failure](https://rangehooderepair.center/error-codes/bertazzoni-4/) - [`T4 flashing` Bertazzoni · Mode, not a failure](https://rangehooderepair.center/error-codes/bertazzoni-t4-flashing/) - [`Fan LED bar flashes slowly and fan speed cannot be changed` BEST · Mode, not a failure](https://rangehooderepair.center/error-codes/best-heat-sentry-fan-light-flashing/) - [`Speed 4 button flashing, speed 3 lit` BEST · Mode, not a failure](https://rangehooderepair.center/error-codes/best-speed-4-flashing/) - [`Boost icon blinking` BlueStar · Mode, not a failure](https://rangehooderepair.center/error-codes/bluestar-boost-icon/) - [`Auto` Bosch · Heat and grease sensors](https://rangehooderepair.center/error-codes/bosch-auto/) [19 more codes, by make](https://rangehooderepair.center/error-codes/) Also related - [**Reading a Range Hood Error Code or Blinking Light** 7 causes](https://rangehooderepair.center/problems/range-hood-error-code/) ### Range Hood Fan Won't Turn Off 6 causes ### Range Hood Buttons or Keypad Not Responding 6 causes ### Range Hood Fan Not Working at Any Speed 6 causes ## The makes it happens on. 29 makes on this site; range hood fan stuck on one speed can show up on any of them. Each mark opens that make's own page. [All 29 brands](https://rangehooderepair.center/brands/) ## Range Hood Fan Stuck on One Speed, where we come out. 9 metros, each with its own page. 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A heat sensor in the canopy pushes it to high when the air below gets hot. It drops back once the area cools. ### Only the high speed works. Is it the motor? It can be a motor winding, but the switch or the board output for the lower speeds is more common. A visit tests which. ### Can the hood be used on the one speed that works? Yes, if it sounds normal and nothing smells hot. Schedule the repair for the other speeds at a time that suits you. ### Is a stuck speed dangerous? Not in itself. It becomes a concern only with a burning smell, a hum or a breaker that trips. --- **[Read on the site: Range Hood Fan Stuck on One Speed: Causes and Fixes](https://rangehooderepair.center/problems/range-hood-stuck-on-one-speed/)** **[Book a visit with RangeHoodeRepair.center](https://rangehooderepair.center/schedule/)**