Care handbook · Los Angeles
When the Hood Blows Out a Low Flame
In one sentence
Hood draught is the reason a perfectly good simmer dies the moment somebody turns the extraction up: a wide canopy over an open cooktop draws more air out of a tight kitchen than the room can quietly replace, and the smallest flame on the range is always the first casualty.
Viking Pro Appliance Repair Los Angeles · (213) 516-4020
The call almost always arrives as a burner that will not stay lit on low, and the first question back is whether the extraction was running at the time. Half the time it was, and half of those are settled before anyone drives out. A large canopy over an open professional cooktop is designed to shift a great deal of air, and a modern kitchen is built to leak very little of it back in. The flame is the smallest thing in the room and it loses that argument first, which is a matter of airflow rather than anything wrong with the range.
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Reproduce it once with the extraction off
Light the burner that keeps failing, bring it down to its lowest setting, and leave it alone for a full minute with the hood switched off and the kitchen as it normally is. A flame that holds steadily through that minute has already told you where the fault is not.
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Bring the fan up one speed at a time
Now switch the extraction on at its gentlest and work upwards, giving each speed the same minute. Note the speed at which the flame starts to shiver and the speed at which it gives up. That pair of numbers is worth more to a technician than any description of the sound it makes.
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Move to another burner and repeat
The pull is not even across a cooktop: a ring directly under the middle of the canopy sits in far more moving air than one at the front corner. If the same low setting survives on a different burner at the same fan speed, the range is behaving and the airflow is not.
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Open a door or a window and run it again
With the house shut, air leaving through the hood has to come from somewhere, and in a well-sealed kitchen there is nowhere obvious. Open a door and repeat the test. A flame that suddenly holds has settled it: the room is short of replacement air, which is a ventilation question rather than a range fault.
When the Hood Blows Out a Low Flame: how often, and when to stop
| How often | What you need | Stop and call if |
|---|---|---|
| Whenever a low flame fails | One minute, one burner and the fan control | The flame also dies with the extraction switched off, which points at the range rather than the draught. |
| After any hood, ducting or window work | The same one-minute test on each burner in turn | A burner now fails at a setting it held perfectly well before the work was done. |
| Before you call anybody about a simmer | A note of which burners failed and at which fan speed | You smell gas at any point: turn every control off, leave the house open, go outside and call the gas utility or 911. |
Follow-ups
Does this mean the hood is faulty?
Usually the opposite. A canopy that can put out a small flame is moving air properly, and what is missing is a path for replacement air to get back into a tightly built kitchen. Viking Pro Appliance Repair Los Angeles can confirm the range is innocent before you spend anything on ventilation, on (213) 516-4020.
Why does it only happen on one burner?
Because the draw across a cooktop is uneven and the smallest flame has the least to hold on to. A back ring under the middle of the canopy sits in moving air that a front corner never feels. Describe which ring it is when you ring Viking Pro Appliance Repair Los Angeles on (213) 516-4020.
It dies on low even with the fan off. What then?
Then the draught is not your problem and the range is. A burner that cannot hold its lowest setting in still air is pointing at the valve, the burner parts or the gas reaching it. That is a diagnostic visit, and Viking Pro Appliance Repair Los Angeles takes it on (213) 516-4020.
Signed by
Keiko Mabuchi
- Works on
- Service technician — cooktops and ventilation
- Years on the tools
- 11
- Certified
- EPA Section 608 certified
A cap sitting slightly proud makes a low flame far easier to blow out — see burner head and cap.
Check the flame with the fan off first, using the simmer check.
Big island hoods over a 48-inch top are common on Encino calls, and so is this complaint.