--- title: "Viking RVL ceiling hood: fourth white light on" description: "What Fourth white LED lit means on Viking RVL ceiling hood: fourth white light ons, what to check before booking, and when it is not a failure at all." url: "https://rangehooderepair.center/error-codes/viking-fourth-white-led/" --- # Viking RVL ceiling hood: fourth white light on The three white LEDs show fan speeds one to three and the fourth shows power mode. ## What Fourth white LED lit actually means. The three white LEDs show fan speeds one to three and the fourth shows power mode. Power mode moves the most air and is meant only for heavy smoke, strong smells or a lot of steam. It returns to speed 3 on its own after 6 minutes. Viking range hood display · also shown as Power mode What to do when Fourth white LED lit 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 Use power mode only for short bursts of heavy smoke or steam. ### 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 Viking Viking range hoods that have grown loud, weak or dark are looked at in place, from the lamps and switches to the blower overhead. ### Source Viking RVL Pureline Pro ceiling hood MVCEH636/648 manual Viking RVL Pureline Pro ceiling hood MVCEH636 and MVCEH648. ## Before you book, in this order. Each step comes from Viking's own guidance for Fourth white LED lit on its range hoods. Follow it to the end: the last card says whether this is a visit. 01 Use power mode only for short bursts of heavy smoke or steam. 02 Expect it to fall back to speed 3 after 6 minutes; that is normal. 03 If the fan will not leave power mode, or the motor cuts out and restarts, book a visit. ### 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 The fourth LED is not an alarm. A motor that switches off and on again by itself is the thermal switch reacting to overheating, which Viking says needs its cause found. ## What you may notice with it. The range hood problems Fourth white LED lit 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 Too Loud: Roar, Whine or Grinding**](https://rangehooderepair.center/problems/range-hood-loud-noise/) - [**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/) ## Viking range hoods. Viking range hoods that have grown loud, weak or dark are looked at in place, from the lamps and switches to the blower overhead. [Viking range hood repair](https://rangehooderepair.center/brands/viking/) More Viking codes [Filter clean icon blinking](https://rangehooderepair.center/error-codes/viking-filter-clean-icon-blinking/) [Green indicator LED](https://rangehooderepair.center/error-codes/viking-green-led/) [First white fan-speed LED flashing](https://rangehooderepair.center/error-codes/viking-first-white-led-flashing/) [Blower comes on at high by itself](https://rangehooderepair.center/error-codes/viking-heat-sensor-high/) 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 78 codes of this kind](https://rangehooderepair.center/error-codes/#family-mode) Viking 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. Viking 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. Viking 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 Viking's own words > The fourth white LED B indicates the Power mode. [Viking RVL Pureline Pro ceiling hood MVCEH636/648 manual](https://middleby-cdn.com/usermanuals/Viking_MVCEH_Hood_Manual_1.pdf) [Viking RVL Pureline Pro ceiling hood MVCEH636/648 manual](https://middleby-cdn.com/usermanuals/Viking_MVCEH_Hood_Manual_1.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Viking RVL Pureline Pro ceiling hood MVCEH636 and MVCEH648. ## Viking Fourth white LED lit 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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Use power mode only for short bursts of heavy smoke or steam. ### Why did my Viking ceiling hood slow down by itself? Power mode lasts 6 minutes and then returns to speed 3. Choose power mode again if you still need it. ### Is it bad to run a Viking ceiling hood in power mode? Viking asks that its use be kept to a minimum, for strong smoke, smells or steam, because of the large air volume it moves. ### My Viking ceiling hood motor stops and starts again. Is that power mode? No. Viking describes a thermal switch that stops the motor when it overheats, from causes such as a pan fire or a blocked opening. Book a visit so the cause can be found. --- **[Read on the site: Viking RVL ceiling hood: fourth white light on](https://rangehooderepair.center/error-codes/viking-fourth-white-led/)** **[Book a visit with RangeHoodeRepair.center](https://rangehooderepair.center/schedule/)**