- “Saturated baffles first, because they cost nothing to rule out”
- “600 CFM assumes an unobstructed duct — most losses are in the run”
- “A coastal termination cap is a salt and grease trap”
Symptom
La Cornue hood suction has faded
Faded extraction with a motor that still sounds healthy is almost never the motor. The 600 CFM these hoods are rated at is specified against an unobstructed six-inch duct — eight inches on the inserts — and the baffle filters are dishwasher safe, so the first fix on this call is frequently free.
- From $95 diagnostic, credited to the repair
- 59 cities and neighborhoods covered
- OEM parts available on order
- In writing the price, before anything is opened
Five ordinary causes
What this usually turns out to be
Cheapest and commonest first, which is also the order we check them in. They sit hundreds of dollars apart, and only the unit settles which one is yours.
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Saturated baffle filters
The commonest cause on this appliance and the cheapest to fix.
Hood filter and duct service from $175 -
A greased or restricted duct run
Length, crushes and elbows added at some point after installation.
Hood filter and duct service from $175 -
A seized backdraft damper
It no longer opens fully, so the fan works against itself.
Hood filter and duct service from $175 -
A blocked termination cap
Salt, grease and a decade of weather on a coastal roof or wall.
Hood filter and duct service from $175 -
A failing blower or capacitor
Where the air path is genuinely clear. Measured rather than assumed.
Hood blower and capacitor repair from $285
In five minutes
Before you call anybody
None of it needs tools, and all of it makes the visit shorter.
-
01
Take the baffles out and weigh them in your hand
Saturated ones are unmistakable once you have felt a clean one.
-
02
Test with the baffles out
If suction returns, the diagnosis is done.
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03
Look up the duct with a torch
A film is normal. A lining is not.
-
04
Hold a tissue to each speed
Four speeds should be four clearly different flows. If they are not, it is the control rather than the path.
How it shows up
What people describe when they call
A shortcut
Narrow it down before anybody arrives
A description of the behaviour leaves a few possible causes. A code names the subsystem before anybody opens anything, which is why it is worth photographing before it clears.
If there is no code at all
H20TOM
H18TOM
H17TOM
H15TOM
H42TOM
H11TOM
150LCI
135LCI
120LCI
CornuFé Cascade
CornuFé Euclid
CornuFé Loge
On a hood, the data plate is inside the frame. All models
In more detail
About La Cornue hood suction has faded
Pull the baffles out and look
Two dishwasher-safe baffle filters with a grease capture system. If they are heavy, tacky, or the channels behind them are filled, that is your answer and a dishwasher cycle is the repair. While they are out, look up into the duct with a torch: a visible film is normal, a lining you could scrape is not. Then run the hood on full with the baffles out and see whether the air moves — if it does, the filters were the problem; if it does not, the problem is beyond them.
What it usually means, by the kind of La Cornue appliance
La Cornue sells one appliance in several forms, and the same behavior points at different things on each of them. A built-in side-by-side and an integrated column are not the same service situation, and a dual-fuel range and an induction range fail in different halves.
- Château motorized hoods — H11TOM through H20TOM, 1100 mm to 2000 mm wide, one 600 CFM blower on a four-speed variable motor, six-inch duct.
- Château hood inserts — 150LCI, 135LCI and 120LCI in 18- and 22-inch depths — 600 CFM, eight-inch duct, LED lights.
- CornuFé hood collection — Cascade, Euclid, Loge and Marquee, plus the 90 and 110 hoods. Same principles, different canopies.
- Two-motor hoods — On the larger canopies one blower can fail silently while the other carries the room — the only symptom is a kitchen that clears slowly.
Why this happens faster over a La Cornue than over most ranges
Look at what is underneath. A power burner at 22,000 BTU, a lava-rock grill at 14,500, a French top holding heat across a whole cast-iron plate and, on the larger ranges, a gas oven venting into the same room. That is a great deal of grease-laden air, in a climate where the windows stay shut and the air conditioning runs. Baffles over this range saturate faster than baffles over an ordinary hob, and the honest maintenance interval is shorter than the one in most people's heads.
What an under-performing hood costs you elsewhere
Grease that the hood does not catch goes onto the cabinets, the ceiling and eventually into the range's own electronics — and on this make the one documented error code, E2, is about electronics getting too hot. A hood at half its rated flow is therefore not only a comfort problem; it shortens the life of the induction generator sitting in the cabinet below. Servicing the hood is part of looking after the range, which is why it appears in the annual maintenance visit rather than only when somebody complains.
This article is based on:
- Official manufacturer documentation
- Internal repair procedures
- Technician repair history
- Company quality standards
Before you book
Questions about La Cornue hood suction has faded
How often should the baffles actually be cleaned?
Over this range, and cooking as people cook on one: every four to six weeks if you use it properly, and monthly if you grill or use the plaque regularly. They go in the dishwasher, which is the whole point of baffles over mesh. The channels and the capture tray behind them want doing a few times a year, and that is a slightly messier job. If somebody has been cleaning them twice a year, the hood has probably been running well below its rating for most of its life and will feel like a different appliance afterwards.
Would a more powerful blower fix it?
Rarely, and it is usually the wrong money. A 600 CFM blower on a restricted duct does not become effective by being replaced with a bigger one — the restriction is what limits the flow, and a bigger fan against the same restriction is louder rather than stronger. Fix the path first and measure it. On the larger canopies there are genuinely two-motor configurations, but that is a specification chosen at order time for a big range, not a retrofit cure for a blocked duct.
Where we do it
Across Miami-Dade, Broward, and Palm Beach
Same terms everywhere we go: an on-site diagnostic first, the price agreed in writing, and the exact figure confirmed once we have seen the unit.
Neighborhoods people ask for by name