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The control strip on the front edge of a stainless chimney range hood, one small timer symbol lit beside the fan keys, steam fading above the burners below.

Vent-A-Hood blower jumping to full power by itself: SensaSource has sensed heat

Vent-A-Hood fits a heat sensor called SensaSource to the two-speed Magic Lung blower on its red rocker switch.

(844) 398-3217

Mon–Sat, 8am–8pm

  • Mode, not a failure
  • No repair needed
  • Source: Vent-A-Hood

Book a visit

Three short steps, about a minute.

or call (844) 398-3217

What Blower jumps from LOW to full power
actually means.

Vent-A-Hood fits a heat sensor called SensaSource to the two-speed Magic Lung blower on its red rocker switch. When that blower is set to LOW and the heat inside the canopy climbs past its limit, or flames reach the hood, the sensor pushes the blower to full power on its own and lets it drop back to LOW once the heat falls. A Vent-A-Hood has no display, so this change in sound is the only signal it gives.

Vent-A-Hood range hood display · also shown as SensaSource, fan speeds up by itself, red switch hood runs on high

What to do when Blower jumps from LOW to full power shows on the range hood

Kind of codeMode, 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 toNo repair

Look at the burners first: if there is flame in a pan or reaching toward the hood, turn the burner off, slide a lid over the pan and leave it, never use water, and get out and call 911 if fire gets into the hood or a cabinet.

Shows up asReading 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.

MakeVent-A-Hood

Vent-A-Hood hoods and liners get a kitchen visit that opens the blower housing first to see the grease it has collected.

SourceVent-A-Hood Owner and Maintenance Guide for models with the Magic Lung blower (L023)

Magic Lung hoods with rocker switches (red, white and black) carry SensaSource on the two-speed blower. Hoods with dial controls switch each blower separately and the guide does not describe a sensor on them.

Before you book,
in this order.

Each step comes from Vent-A-Hood's own guidance for Blower jumps from LOW to full power on its range hoods. Follow it to the end: the last card says whether this is a visit.

01

Look at the burners first: if there is flame in a pan or reaching toward the hood, turn the burner off, slide a lid over the pan and leave it, never use water, and get out and call 911 if fire gets into the hood or a cabinet.

02

If it is only hard searing or several burners on high, leave the blower running; it should settle back to LOW a few minutes after the heat comes down.

03

To stop the fan early, move the red rocker to its middle OFF position once the pans are off the heat.

04

If the blower races on a cold hood, or will not leave full power after everything has cooled, book a visit so the sensor and the switch can be tested.

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 jump to full power is not a motor about to fail, and it only concerns the two-speed blower on the red switch. The extra single-speed blower on a black switch is never run by SensaSource, so a black-switch blower that stops or races points somewhere else.

What you may
notice with it.

The range hood problems Blower jumps from LOW to full power tends to arrive with. Answer these at the range hood before anyone is booked.

All problems

Before you call

Reading a Range Hood Error Code or Blinking Light

All 7 causes, cheapest first

It also comes with

Close view of the front control strip of a stainless wall-mount chimney range hood on a tiled wall, a few abstract lit segments on its small display and one indicator blinking, the range hood's canopy filling the upper half of the frame. 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

Vent-A-Hood
range hoods.

Vent-A-Hood hoods and liners get a kitchen visit that opens the blower housing first to see the grease it has collected.

Vent-A-Hood range hood repair

Mode, not a failure on other makes

Bertazzoni CBEST Fan LED bar flashes slowly and fan speed cannot be changedBlueStar Timer icon blinking, blower runningBosch EndCafé Low, Med and High LEDs rolling blinkDacor Timer LED blinkingElica SndFaber Intensive speed drops back after 6 or 10 minutes
All 80 codes of this kind
A stainless steel wall-mount chimney range hood fixed to a white subway tile wall in a US home kitchen, the range hood's rectangular chimney cover rising straight to the ceiling, soft steam rising from a pot into the canopy, the range hood filling the upper half of the frame, the cooking surface below cropped and out of focus at the bottom edge. Vent-A-Hood 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.

 A slim stainless under-cabinet range hood mounted beneath white shaker wall cabinets in a US home kitchen, the range hood's two lamps glowing onto steam rising from a simmering pot, the range hood and the cabinets above it filling the upper half of the frame, the cooking surface below cropped and out of focus. Vent-A-Hood 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.

 A large stainless island range hood hanging from the ceiling on its four-sided chimney over a kitchen island with a white stone top in a US home, steam rising from a pan into the range hood's canopy, the range hood centered in the upper half of the frame, the burners on the island below cropped and out of focus. Vent-A-Hood 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 Vent-A-Hood's own words

If the heat reaches an unacceptable level inside the hood, or a range fire occurs
Vent-A-Hood Owner and Maintenance Guide for models with the Magic Lung blower (L023) Vent-A-Hood Owner and Maintenance Guide for models with the Magic Lung blower (L023) Vent-A-Hood Owner and Maintenance Guide for models with the Magic Lung blower (L023) Vent-A-Hood Technologies page

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Magic Lung hoods with rocker switches (red, white and black) carry SensaSource on the two-speed blower. Hoods with dial controls switch each blower separately and the guide does not describe a sensor on them.

Vent-A-Hood Blower jumps from LOW to full power 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.

All service areas

Tampa BayFL · 31 areas

OrlandoFL · 30 areas

Miami / South FloridaFL · 47 areas

New York MetroNY · 75 areas

HoustonTX · 36 areas

ChicagoIL · 50 areas

Los AngelesCA · 95 areas

San DiegoCA · 31 areas

San Francisco Bay AreaCA · 74 areas

A family cooking together under a stainless range hood in a bright kitchen.
For the heart of your home.

Questions
about Blower jumps from LOW to full power.

Can I clear Blower jumps from LOW to full power myself?
Look at the burners first: if there is flame in a pan or reaching toward the hood, turn the burner off, slide a lid over the pan and leave it, never use water, and get out and call 911 if fire gets into the hood or a cabinet.
Why does my Vent-A-Hood suddenly get loud while I sear a steak?
The SensaSource sensor on the two-speed blower has felt enough heat in the canopy to switch from LOW to full power. It drops back to LOW by itself once the pan cools or comes off the burner.
Can I turn SensaSource off on a Vent-A-Hood?
Vent-A-Hood's guide does not give an owner setting to disable it. You can still turn the blower off with the red switch in its middle position, which is the normal way to stop the fan after cooking.
My Vent-A-Hood runs at full power with nothing cooking. Is that the sensor?
SensaSource should only react to heat, so full power on a cold hood suggests the sensor or the rocker switch is misreading. That is worth a visit, because the blower can wear faster running flat out all the time.

Back to your everyday

Still showing Blower jumps from LOW to full power?

Three things make the booking useful: the letters or blink pattern exactly as they showed, the full model number from the label behind the filters, and whether the fan still moves air on every speed. With those, the technician arrives with half the answer already worked out.

Schedule a repair Call (844) 398-3217
(844) 398-3217 Schedule a repair