Cooker Hood Not Working in Amersham - Common Faults and How to Fix Them

Published October 2026 | Cooker Hood Not Working Common Faults

This guide covers the most common reasons a cooker hood stops working entirely or starts performing poorly, and walks you through a logical sequence of checks and fixes you can carry out yourself. It's aimed at homeowners in Amersham and the surrounding parts of Buckinghamshire who want a practical starting point before spending money on a professional callout.

Before You Start - Safety First

Working on a cooker hood involves electricity, so you need to take a few precautions before you touch anything. Don't skip this section just because the hood appears to be dead.

• Turn the cooker hood off at the wall switch or isolate it at your consumer unit (fuse box). If you're not sure which circuit it's on, switch off the main breaker.
• Don't assume the hood is completely de-energised just because the controls aren't responding. A faulty control board can leave components live while appearing switched off.
• If you can see burnt marks, smell burning plastic, or notice any damaged wiring, stop immediately. Don't investigate further yourself - this needs a qualified engineer.
• Allow the hood to cool for at least 30 minutes before working around the motor or lighting compartment, as both can retain heat after use.
• If your hood is hardwired into the mains supply rather than plugged in, confirm the circuit is isolated at the consumer unit before opening any access panels.

The checks in this guide are safe for a competent DIYer. Anything involving live internal wiring, motor replacement, or control board diagnosis is better handled by a professional.

What You Will Need

Most of these checks don't require specialist tools. Here's what to have ready before you start.

Tools:

• Flat-head and Phillips screwdrivers
• A multimeter (useful but not essential for the early checks)
• A torch or phone light
• A soft brush or vacuum cleaner with a narrow attachment

Materials:

• Replacement grease filters specific to your model - check the make and model number, usually printed on a label inside the hood
• Replacement carbon or charcoal filters if your hood recirculates air rather than venting outside
• A mild degreaser or washing up liquid
• Replacement bulbs if the lighting has failed - LED or halogen depending on your model

Time estimate: Allow 30 to 90 minutes depending on the fault. A blocked filter can be dealt with in 20 minutes. Tracing an electrical fault will take longer.

Step-by-Step Instructions

Step 1 - Check the Power Supply

The first thing our engineers check on any cooker hood callout is the power supply, because a surprising number of faults come down to nothing more complicated than a tripped circuit breaker or a blown plug fuse.

Open your consumer unit and look for any tripped breakers. If your hood runs off a standard plug, check the fuse inside the plug - a 3A or 5A fuse is typical. Replace it and test. If the circuit trips again as soon as power is restored, there's an electrical fault inside the hood or its wiring that needs professional diagnosis - don't keep resetting it.

Also check that any wall isolator switch hasn't been accidentally turned off. It sounds obvious, but it's one of the most common explanations for a hood that "just stopped working" with no warning.

Step 2 - Inspect and Clean the Grease Filters

Blocked grease filters are one of the most common causes of a cooker hood underperforming or cutting out. Clogged filters restrict airflow and can cause the motor to overheat and shut down as a safety measure, leaving the hood apparently dead even though nothing has actually failed.

Most cooker hoods - whether it's a Bosch Serie model, a Hotpoint, or a Beko - use metal mesh grease filters that slide or clip out from underneath the unit. Remove them and hold them up to the light. If you can't see through them clearly, they're clogged.

Wash them in hot water with washing up liquid, or run them through the dishwasher on a high-temperature cycle. Let them dry completely before refitting. Manufacturers typically recommend cleaning these every four to six weeks under regular use.

Step 3 - Check or Replace Carbon Filters

If your cooker hood recirculates air back into the kitchen rather than venting it outside through ducting, it relies on carbon (charcoal) filters to absorb cooking odours. Unlike grease filters, carbon filters can't be washed - they need replacing.

A saturated carbon filter doesn't usually cause the hood to stop working altogether, but it makes the motor work harder over time, which can lead to overheating faults. In Amersham properties where external ducting hasn't been fitted, recirculating hoods are common, so this is worth checking early.

Carbon filters typically need replacing every three to six months depending on how often you cook. Replacements for common brands like LG, Samsung and Hotpoint are widely available online and cost between 10 and 30 pounds.

Step 4 - Test the Fan Speeds and Control Panel

If the hood powers up but the fan doesn't respond to speed changes, or only works on certain settings, the fault is likely with the speed selector switch, the control board, or one of the motor windings rather than a complete motor failure.

Try cycling through all the available speed settings. If the fan runs on low but cuts out on high, this points to a motor winding or capacitor issue rather than total failure. If nothing responds at all when the controls are pressed, the control board itself may have failed.

Some modern touch-control hoods from Bosch or LG have a soft reset function that can clear a locked-up board without any parts replacement. Check your user manual or the manufacturer's support page for the reset procedure specific to your model - it's worth trying before assuming you need a part.

Step 5 - Check the Lighting

If the fan works but the lights have failed, this is almost always a bulb or LED strip issue rather than anything more involved. Check which type your hood uses - halogen capsule bulbs are still common in older hoods, while most newer models use LED strips or integrated LED modules.

Replace like-for-like and make sure the replacement is rated correctly for your fitting. Using a bulb with too high a wattage can damage the lamp holder or trigger the thermal cut-out built into the hood.

If you've fitted a new bulb and the light still doesn't work, the lamp holder itself may be corroded or the lighting circuit within the hood may have failed - this is worth flagging to an engineer when they're already on site for another fault.

Step 6 - Inspect the Ducting and External Vent

If your cooker hood has become louder but extraction has weakened at the same time, the ducting is a likely culprit. Blocked or damaged ducting is a common cause of performance failures that's often overlooked during DIY diagnosis.

Start at the external wall vent grille. It should open freely when the fan runs and snap shut when it stops. A stuck or blocked grille immediately reduces extraction performance. Then check for any collapsed or kinked flexible ducting internally - this is particularly common in older Amersham properties where the duct has to navigate tight corners or roof spaces, and the flexible section has been there for years.

Rigid metal ducting gives significantly better airflow than flexible, so if your installation uses a long run of flexible duct, this may be contributing to ongoing performance issues rather than a one-off fault.

Step 7 - Listen to the Motor

A healthy cooker hood motor runs with a consistent, smooth hum. Changes to that sound are usually diagnostic in themselves.

• Grinding or rattling - fan blades are obstructed, or the motor bearings are worn
• Humming with no airflow - the motor capacitor has likely failed, which is a relatively inexpensive fix if caught early
• Burning smell from the motor area - the motor windings have failed and the whole motor needs replacing

Motor replacement on a mid-range cooker hood typically costs between 80 and 180 pounds including parts and labour, depending on the brand and how accessible the motor is within the hood's casing.

Step 8 - Run a Diagnostic Check

If you've worked through the above steps and still can't pinpoint the fault, the Voltrade GoFIX diagnostic tool can help you narrow it down before booking an engineer. It walks you through your hood's symptoms and points you towards the most likely cause, which can save time and avoid paying for a callout to identify something you could have fixed yourself.

What to Do If This Does Not Fix It

If you've worked through all the steps above and the hood still isn't working, there are a few more things to consider before booking a repair.

First, check whether the appliance is still under warranty. Most new cooker hoods carry a one or two year manufacturer's warranty, and some retailers offer extended cover. If it's under warranty, contact the manufacturer directly - attempting your own repairs beyond basic filter cleaning may void the cover, so read the terms carefully.

If the hood is out of warranty and the fault is in the motor or control board, you're into a decision about repair versus replacement. As a rough guide, if the repair cost is going to exceed 50% of the price of an equivalent new unit, replacement is usually better value. A decent mid-range cooker hood from brands like Bosch, Hotpoint or Beko typically costs between 150 and 350 pounds for the unit alone, with fitting on top depending on whether ducting needs to be modified.

Also consider the age of the hood. A five-year-old motor replacement is usually worth doing. On a ten-year-old hood, you may find another component fails shortly afterwards, so the economics of repair become less compelling.

When to Stop and Call a Professional

Some faults are safe to investigate yourself. Others aren't. Here's when to stop and pick up the phone.

• You can see burnt or melted wiring anywhere inside the hood
• The circuit breaker trips every time the hood is switched on
• There's a burning smell from the motor or electrical compartment that isn't explained by dirty filters
• The hood is hardwired into the mains and you'd need to access the terminal block to proceed
• You've cleaned the filters, replaced the fuse, and checked the ducting, but the hood still won't power on at all

For homeowners in Amersham and across Buckinghamshire, a qualified appliance repair engineer can typically diagnose a cooker hood fault within an hour. Diagnostic callout charges commonly range from 50 to 85 pounds, which is often redeemable against the repair cost if you proceed.

Questions About This Process

Why has my cooker hood stopped extracting even though the fan is running?

This is almost always a filter or ducting problem. If the grease filters are heavily clogged, they restrict airflow to the point where the fan spins but very little air actually moves through the hood. Clean the metal grease filters first. If the hood recirculates rather than ducts outside, the carbon filters may be saturated and need replacing - these can't be washed. If both sets of filters are clean and airflow is still poor, inspect the ducting for blockages, kinks, or a stuck external vent grille.

How often should I service my cooker hood to prevent faults?

Cleaning the metal grease filters every four to six weeks is the single most effective maintenance step for most households. Carbon filters in recirculating hoods should be replaced every three to six months. Beyond that, an annual inspection of the ducting, fan blades and motor is good practice - particularly in Buckinghamshire properties where kitchens see heavy daily use. Catching a worn motor bearing or a partially blocked duct early costs far less than replacing a burnt-out motor or dealing with a failed control board.

Is it worth repairing an old cooker hood or should I just replace it?

It depends on the age of the hood and what the repair actually involves. If it's under five years old and the fault is a failed capacitor, a blown fuse, or a faulty speed selector switch, repair is almost always worth it. If it's over ten years old and needs a new motor or control board, the maths often favour replacement - you'll get a more energy-efficient unit and a fresh warranty. An engineer can give you a clear answer once the fault is diagnosed, and the Voltrade GoFIX tool can help you weigh up the options before anyone comes out.