Cooker Hood Not Working in Petworth - Common Faults and the Myths That Make Things Worse

Published August 2026 | Cooker Hood Not Working Common Faults

Most people assume that if a cooker hood is making noise, it's doing its job. That assumption is wrong, and it costs homeowners money every single day. The myths surrounding cooker hood faults are so deeply embedded that many people in Petworth end up replacing perfectly repairable units - or living with a hood that's extracting next to nothing while they think everything is fine.

Myth: If the Fan Is Running, the Hood Is Working

The reality

A spinning fan motor is not the same as effective extraction. Our engineers see this constantly - a hood that hums away on full power but shifts almost no steam or grease-laden air out of the kitchen. The fan motor itself is rarely the first thing to fail. What actually stops extraction is typically one of three things: a saturated grease filter that has become so blocked it's acting as a solid wall, a charcoal filter in a recirculating hood that's long past its replacement date, or a ducted system where the external vent flap has seized shut.

The test is simple. Hold a piece of kitchen roll near the hood intake on full power. On a properly functioning unit with a clear filter and unobstructed duct, the paper should be drawn firmly toward the grille. If it barely moves, or flutters weakly, you have a flow problem - not a fan problem. Before assuming the motor is dying, always check the filters and the external vent first.

Grease filters on most mid-range hoods - brands like Bosch, AEG, and Elica - should be cleaned every four to six weeks depending on how heavily the hob is used. Metal mesh filters can go in the dishwasher. Charcoal filters in recirculating hoods cannot be cleaned and need replacing every three to six months. Many homeowners in West Sussex have never replaced their charcoal filter at all, despite cooking daily for years.

Myth: A Hood That Won't Turn On Needs a New Motor

The reality

When a cooker hood does nothing at all - no fan, no lights, complete silence - the instinct is to assume the motor has burned out and the unit is finished. In our experience, this is the least likely cause of a total shutdown. The most common culprits are far more mundane.

Start with the obvious: check the fuse. Integrated cooker hoods are typically wired into a fused spur on the kitchen circuit, and a blown fuse will kill everything instantly. A replacement fuse costs under a pound. Beyond that, thermal cutout switches are a very common fault on hoods from brands like Hotpoint and Beko. These are safety devices designed to shut the hood down if it overheats - usually because the grease filters were never cleaned and heat built up in the motor housing. Once tripped, the thermal cutout needs resetting manually. On most models this is a small button accessible after removing the grease filter. It doesn't require a new motor, or even a call-out in many cases.

On hoods with electronic touch controls rather than mechanical switches - common on Neff and Siemens models - a control board fault can produce the same total shutdown symptoms. The board is a separate component and typically costs between 40 and 120 pounds to replace, which is a fraction of a new hood.

Myth: A Noisy Cooker Hood Just Needs Tightening Up

The reality

Rattling and vibrating cooker hoods send many Petworth homeowners up a ladder with a screwdriver, tightening every visible fastener they can find. Sometimes this helps. More often it doesn't, because the source of the noise is not loose screws - it's something specific that needs diagnosing properly.

The most common causes of hood noise are, in rough order of frequency:

1. A grease filter that's not seated correctly in its channel and vibrates against the housing at speed.
2. A fan blade that has accumulated a thick, uneven layer of grease on one side, throwing the impeller off-balance and creating a rhythmic thudding or grinding sound.
3. Worn motor bearings, which produce a steady whine or grinding that gets worse at higher speeds.
4. Ductwork that has come loose at a joint and rattles as air passes through it.
5. The external backdraft damper - the flap that opens when the hood runs - seizing on its hinge and fluttering rather than opening cleanly.

Points one, two, and four are user-serviceable in most cases. Point three - bearing wear - typically means a motor replacement, but the motor on a standard chimney hood costs between 30 and 80 pounds for a branded spare part, and fitting is usually under an hour's work for a competent engineer. The hood itself rarely needs replacing because of noisy bearings.

If you're in Petworth and running the Voltrade GoFIX diagnostic tool on your appliance, it'll walk you through exactly this kind of noise diagnosis - narrowing down whether the fault points to filters, balance, or motor wear before any engineer visits.

Myth: Recirculating Hoods Are Practically the Same as Ducted Hoods

The reality

This is one that gets people into trouble at the point of purchase, and then creates ongoing frustration when faults develop. Recirculating hoods - the kind that filter air through charcoal and push it back into the kitchen rather than venting it outside - are fundamentally different in how they work and how they fail.

A ducted hood, properly installed with a clean run to an external vent, removes moisture, grease, and odour from the kitchen entirely. A recirculating hood removes grease particles and some odour, but returns the warm, moist air back into the room. In kitchens in older West Sussex properties - particularly in Petworth, where terraced and semi-detached Victorian houses often make external ducting difficult - recirculating is sometimes the only practical option. But it's not equivalent performance, and the maintenance demands are higher.

The most common fault specific to recirculating hoods is the charcoal filter reaching the end of its life and the hood continuing to run regardless. There's no sensor to tell you the filter is spent. The hood sounds fine, the fan runs fine, but the air quality in the kitchen deteriorates noticeably. Many homeowners assume the hood is faulty when it's simply doing nothing useful because the filter is exhausted. Replacement charcoal filters for common models - including LG and Samsung integrated hoods - typically cost between 15 and 35 pounds per set, and on most models the swap takes under five minutes.

Myth: The Lights Failing Means There's a Serious Electrical Fault

The reality

When the lights on a cooker hood stop working, the assumption is often that something has gone wrong with the wiring or the control board. In the vast majority of cases, it's simply a blown bulb. This sounds obvious, but cooker hood bulbs are not standard fittings, and people are often caught out by not knowing what replacement they need.

Many hoods use G4 or G9 halogen capsule bulbs, typically rated at 20W or 40W. More modern hoods from Bosch and Neff have moved to LED modules, which last considerably longer but can be more expensive when they do eventually fail - typically between 8 and 25 pounds per module depending on the model. The key point is that a failed bulb or LED module is a consumable part, not a wiring fault.

Where a genuine electrical issue does exist, it's most commonly the switch or button that controls the lighting circuit, not the wiring itself. Touch-sensitive controls can fail due to moisture ingress from steam - a particularly common problem on hoods positioned over high-output gas hobs. In these cases, the control panel often needs replacing rather than the whole unit. For most branded hoods this is a serviceable repair costing typically between 60 and 150 pounds including parts and labour.

Myth: You Should Replace an Old Hood Rather Than Repair It

The reality

The appliance industry has done a good job of convincing people that anything over five years old is disposable. Our engineers in West Sussex would push back on that firmly. A well-built chimney hood from a reputable manufacturer - Bosch, Elica, or Neff, for example - is mechanically simple. There's a motor, an impeller, some filters, a control board, and some lights. With the right parts, most of these hoods are repairable for well under 200 pounds even when the fault is significant.

A replacement hood of equivalent quality typically costs between 250 and 600 pounds, plus fitting, which on a chimney hood with existing ductwork usually adds another 80 to 150 pounds. The maths on repair versus replacement is often much closer than manufacturers would prefer you to think, particularly on hoods that are only eight to twelve years old.

The exception is when a motor fails on a budget hood that cost under 100 pounds new. In those cases the motor spare can cost more than the unit is worth, and replacement makes sense. But on mid-range and above hoods, repair is nearly always worth investigating before writing the unit off.

What Actually Matters - Expert Advice

After years of cooker hood call-outs across Petworth and the wider West Sussex area, the pattern is clear. Most hood faults are either maintenance failures - filters that were never cleaned or replaced - or single component failures that are well within the scope of a standard repair.

The most important things to know:

1. Clean metal grease filters monthly if you cook frequently. Run them through the dishwasher on a hot cycle or soak them in a degreasing solution.
2. Replace charcoal filters every three to six months on recirculating hoods. Do not wait until you can smell that they're exhausted.
3. Check the external vent annually on ducted hoods. The backdraft flap can seize, particularly in older installations or after a cold winter.
4. If the hood trips out completely, check the fuse and the thermal cutout reset before calling anyone.
5. Get a diagnosis before agreeing to a full replacement. A good engineer should be able to tell you within the first visit whether the fault is repairable and at what cost.

Call-out and diagnostic rates for appliance engineers in the Petworth area typically run between 60 and 90 pounds for the first hour. A repair on top of that - motor replacement, control board, or similar - commonly adds 50 to 150 pounds in parts and labour. Compare that to a full replacement and fitting before making any decisions.

Myth-Busting Questions

Why does my cooker hood smell even when it's running?

A hood that smells while running is almost always a filter problem. On a recirculating hood, an exhausted charcoal filter stops absorbing odours and can actually start releasing previously trapped smells back into the kitchen. On a ducted hood, a saturated grease filter can harbour bacteria and produce an unpleasant cooking smell even when the unit is operating. Replace the charcoal filter, degrease the metal mesh filters thoroughly, and wipe out the interior of the hood casing with a degreasing solution. If the smell persists after that, have the ductwork inspected for grease build-up in the run to the external vent.

Can I fit a new cooker hood myself in Petworth?

Replacing a like-for-like hood on an existing fused spur with existing ductwork is generally within the capability of a confident DIYer. You're not creating new electrical circuits, so there's no legal requirement for an electrician on a straightforward swap. However, if you're installing into a new position, adding a new socket, or running new ductwork through a wall, those elements need to be done correctly and signed off appropriately. New ductwork penetrations in an older Petworth property - particularly anything affecting external walls in a conservation area - may also have planning implications worth checking first.

How long should a cooker hood last before needing repairs?

A well-maintained hood from a quality manufacturer should run for ten to fifteen years without major faults. The key word is maintained - hoods that never have their filters cleaned or replaced typically show motor wear and performance problems within five to seven years as the restricted airflow causes the motor to work harder and run hotter than it was designed to. Budget hoods at the lower end of the market have shorter expected lifespans and less available parts support, which makes repair less viable when something does go wrong. Brands like Bosch and Neff tend to have good parts availability even on older models, which works in your favour if you ever need a repair.

FAQ

Why has my cooker hood stopped extracting in Petworth but the fan still works?

This is one of the most common faults our engineers encounter across West Sussex. When the fan runs but extraction is poor, the issue is almost always airflow restriction rather than a motor fault. Check the metal grease filters first - if they're coated in a thick layer of grease, they're significantly reducing airflow. On recirculating hoods, a spent charcoal filter causes the same effect. On ducted hoods, also check that the external vent flap is opening freely when the hood is running. All of these are user-serviceable checks before calling an engineer.

How much does it cost to repair a cooker hood in Petworth?

Diagnostic call-out costs in the Petworth area typically run between 60 and 90 pounds. The total repair cost depends heavily on the fault: a control board replacement commonly adds 40 to 120 pounds in parts, a motor replacement typically 30 to 80 pounds in parts plus fitting time, and a switch or lighting repair often 20 to 60 pounds in parts. Most single-component repairs come to between 80 and 200 pounds all in, which is worth comparing carefully against a replacement hood of equivalent quality before committing to either option.

Is it worth repairing a cooker hood that is over ten years old?

Age alone isn't a reliable indicator of whether repair makes sense. The more important questions are: what exactly has failed, what does the repair cost compared to a like-for-like replacement, and is the hood otherwise in reasonable condition? Many hoods over ten years old from established brands like Bosch, Neff, and Elica are still well worth repairing because the parts are available and the build quality holds up. The Voltrade GoFIX diagnostic tool can help you assess the fault before you commit to any spend, so you go into the decision with clear information rather than guesswork.