Cooker Hood Not Working in St Austell - Common Faults and How to Keep Yours Running

Published August 2026 | Cooker Hood Repair

How Long Should a Cooker Hood Last and What Affects That

A cooker hood is one of the most overlooked appliances in a kitchen. It runs every time you cook, it deals with heat, steam, grease, and airborne particles on a daily basis, and most homeowners clean it once every few months at best. Given all that, it's fair to say they earn their keep.

In most cases, a well-maintained extraction hood from a reputable manufacturer - brands like Bosch, Neff, Elica, or Franke - will run reliably for 12 to 15 years. Budget models from Hotpoint or Beko can still last a decade if they're looked after properly. The units our engineers see failing prematurely almost always share the same story: filters that haven't been cleaned in years, motors that have been running under strain, and ducting that's partially blocked.

Several factors directly affect how long your hood will last:

1. How often you cook. A household that uses the hob twice a day puts far more hours on the motor and collects grease far faster than one cooking three or four times a week. That's not a reason to avoid cooking - it just means maintenance needs to be proportionally more frequent.
2. Whether it's ducted or recirculating. Ducted hoods that vent outside typically last longer because they're expelling the grease-laden air rather than passing it through carbon filters. Recirculating models work harder and their filters saturate more quickly.
3. The quality of the original installation. A hood fitted with ducting that's too narrow, has too many bends, or is partially obstructed will run its motor at higher load constantly. In Cornwall's older housing stock - where kitchens often weren't designed with extraction in mind - this is a surprisingly common cause of early motor failure.
4. How consistently the filters are serviced. This one factor, more than any other, determines whether your hood reaches 10 years or 15.

The Maintenance That Actually Makes a Difference

Most cooker hood maintenance guides are vague to the point of being useless. "Clean your filters regularly" doesn't tell you anything. Here's what actually needs to happen, and when.

Grease Filters

The metal mesh grease filters fitted to most modern hoods should be cleaned every four to six weeks for a household that cooks daily. If you're cooking less frequently, every six to eight weeks is usually fine. The test is simple: hold the filter up to the light. If you can't see through it clearly, it needs cleaning.

Most metal grease filters are dishwasher-safe and a hot cycle with a good detergent will do the job. If you're washing by hand, soak them in hot water with a degreasing washing-up liquid for 20 minutes before scrubbing. Avoid abrasive pads that damage the mesh. Rinse thoroughly and let them dry completely before refitting - trapping moisture behind the filter accelerates corrosion on the hood casing.

Carbon Filters

If your hood recirculates air rather than venting outside, it will have carbon (activated charcoal) filters. These cannot be washed - they need replacing. Typically they should be swapped out every three to four months, though some higher-end units with larger filter beds can go six months. Carbon filters for common models - Bosch DHU625, Franke FDF 914 XS, Elica ranges - typically cost between 20 and 45 pounds for a pair. Running with saturated carbon filters means your hood is recirculating grease-laden, odorous air back into the kitchen and working the motor much harder than necessary.

Fan Blades and Motor Housing

This one gets skipped almost universally. Grease builds up on the fan blades themselves over time, and that imbalance forces the motor to work harder with every rotation. Every 12 to 18 months, it's worth removing the filters and carefully cleaning the fan blades with a degreasing spray. Our engineers in St Austell and across Cornwall regularly find fan assemblies caked with years of accumulated grease on units where the homeowner thought the filters were the only thing needing attention.

Ducting and External Vent

For ducted hoods, the external vent flap should be checked annually. Bird nesting material, leaves, and general debris can partially or fully block the outlet, causing back-pressure that strains the motor. This is particularly common on St Austell properties with older external vent covers that don't have adequate pest guards fitted.

Warning Signs Your Cooker Hood is Reaching the End of Its Life

Cooker hoods rarely fail outright overnight. They decline gradually, and knowing what to watch for means you can act before a fault becomes a replacement.

• Reduced suction power. If your hood used to clear steam and cooking smells within a minute or two and it's now struggling to do the same job, that's the most common early indicator. It could mean blocked filters - the first thing to check - but it can also signal a weakening motor or a partial blockage in the ducting.
• Unusual noise. A rattling sound often means a loose filter or a screw that's worked free. A grinding or humming noise that wasn't there before is more concerning - it typically points to worn motor bearings. On older units, this noise tends to get progressively worse before the motor seizes.
• The lights have stopped working or flicker. This seems minor but it's worth addressing. Failed lights put additional strain on the circuit board, and on integrated LED units, a failing driver board can eventually take out the extraction controls too.
• The controls are unreliable. Speed settings that only work intermittently, or a unit that doesn't respond to buttons the first time, often indicate a failing control board. This can be repaired on most mid-range models, but on budget units the replacement board cost can tip the maths towards replacement.
• Vibration that wasn't present before. As motor bearings wear, the fan assembly can develop a wobble. That vibration resonates through the hood casing and can eventually loosen ducting connections, cause leaks, and accelerate wear on surrounding components.

When our engineers use the Voltrade GoFIX diagnostic tool on a cooker hood fault call, airflow performance testing and motor load readings are among the first checks we run. It gives a clearer picture than relying on symptoms alone, particularly when a homeowner isn't sure how long a problem has been developing.

Repair vs Replace - the Honest Calculation

The standard advice is that if a repair costs more than half the price of a new unit, replace it. For cooker hoods, that rule holds reasonably well in most cases, but there are a few nuances worth knowing.

Common repairs and their typical costs in the UK:

• Motor replacement: typically between 120 and 220 pounds including parts and labour. On a high-quality hood that's three to five years old, this is almost always worth doing. On a budget model over eight years old, you're better off replacing.
• Control board replacement: typically between 80 and 160 pounds. The availability of boards for your specific model is the key variable here. For Bosch and Neff models, parts are generally available for 10 to 12 years from manufacture. For less common brands, you may find the board is no longer stocked.
• Light unit replacement: typically between 40 and 90 pounds. Generally worth repairing unless the unit has other issues.
• Ducting repair or replacement: typically between 60 and 150 pounds depending on access and run length.

A mid-range replacement hood - something like a Bosch Serie 4 or a CDA model - typically costs between 200 and 400 pounds for the appliance, plus 80 to 150 pounds for fitting, depending on whether new ducting is needed. So a like-for-like replacement runs to roughly 300 to 550 pounds in total for most St Austell households.

If a repair quote is coming in above 200 pounds on a unit over eight years old, start costing up replacements before you commit. If the hood is under six years old and the fault is a single component, repair is almost always the more sensible route.

Annual Service - What It Should Include

A proper annual cooker hood service isn't just a clean. Here's what it should cover:

1. Filter inspection and cleaning - grease filters cleaned, carbon filters assessed and replaced if due.
2. Fan blade inspection and degreasing - removing the build-up that monthly filter cleaning doesn't address.
3. Motor bearing check - listening for early signs of wear under load across all speed settings.
4. Airflow performance test - measuring extraction rate at each speed and comparing to the manufacturer's rated output. A significant drop indicates ducting issues or motor degradation.
5. Ducting inspection - checking for kinks, loose connections, and blockages including the external vent.
6. Electrical connections check - inspecting for loose terminals, signs of heat damage, or corrosion.
7. Control function test - verifying all speeds and lighting functions operate correctly.
8. Casing and mounting check - confirming the unit is still securely fixed and that there's no moisture ingress around ducting penetrations.

A service of this scope from a qualified appliance engineer typically costs between 60 and 100 pounds in Cornwall. It's worth it every one to two years on a hood that's in daily use, particularly if it's a ducted unit where motor issues can develop quietly over time.

Simple Habits That Extend the Life by Years

Beyond scheduled maintenance, day-to-day habits make a meaningful difference to how long a cooker hood lasts.

Switch it on before you start cooking, not when the kitchen fills with steam. Running the hood from the start of cooking means it handles a lower volume of grease and steam at lower intensity, rather than trying to clear a kitchen already saturated with cooking vapour. It's easier on the motor and the filters.

Use the lower speed settings when possible. High speed is there for heavy-duty frying and grilling, not every pot of pasta. Running on medium where it's sufficient keeps motor hours lower and reduces noise-related wear on bearings.

Don't ignore the light when it fails. A bulb going is easy to ignore, but the resulting heat build-up in a confined lamp housing can cause problems for nearby components over time, particularly on older halogen units. Replace bulbs promptly.

Keep the area around the hood clear. Grease and steam that condenses on the underside of overhead cupboards can find its way back into the hood housing. Regular wiping of the surrounding surfaces reduces this.

In Cornwall's coastal areas, take corrosion seriously. Salt air accelerates surface corrosion on hood casings and external vent covers, particularly for properties within a mile or two of the coast. An annual wipe-down of external metal surfaces with a light protective spray makes a noticeable difference over time. Several of our engineers covering St Austell and the surrounding coastal areas have seen hoods fail specifically because of corrosion that's worked its way into the motor housing.

Check the external vent cover each autumn. It takes two minutes and can save a motor. A blocked external vent is one of the simplest causes of early motor failure and also one of the easiest to prevent.

Maintenance Questions

How often should I clean my cooker hood filters?

For a household cooking daily, metal grease filters should be cleaned every four to six weeks. If your filter looks visibly clogged or discoloured before that point, clean it sooner. Carbon filters in recirculating hoods need replacing every three to four months - they can't be washed. Running with blocked filters is the single most common cause of premature motor failure on cooker hoods, so this is worth staying on top of.

Why has my cooker hood suddenly got much louder?

A sudden increase in noise is nearly always one of three things: a loose or damaged filter rattling in its housing, grease build-up on the fan blades causing an imbalance and vibration, or the early signs of motor bearing wear. The first two are maintenance issues you can address yourself. If cleaning the filters and checking they're properly seated doesn't resolve it, the noise is likely mechanical and worth getting an engineer to look at before it worsens. Don't run a grinding motor - it accelerates damage significantly.

My cooker hood isn't extracting properly even though the filters are clean - what should I check?

Start with the external vent - blocked outlet flaps are a common cause of reduced performance, particularly in Cornwall where debris and nesting birds are frequent culprits. If the vent is clear, the ducting run itself may have a partial blockage or a kink that's developed over time. On older installations, ducting joints can pull apart slightly and allow air leakage. If you've ruled those out, a motor that's losing performance under load is the likely cause and will need professional assessment.

Is it worth repairing a cooker hood that's over 10 years old?

It depends on the fault and the unit. If it's a motor replacement on a good quality Bosch or Elica hood, 120 to 180 pounds in repairs can buy you another five years of use, which is hard to argue against. If it's a budget hood and the repair involves a control board that's difficult to source, replacement at 250 to 400 pounds all-in usually makes more sense. The age of the unit matters less than the cost of the specific repair relative to replacement. Our engineers can give you a clear steer once the fault is diagnosed.