How to Fix a Rangehood That Is Not Extracting Properly
A rangehood that's not extracting cooking smells, steam and grease properly defeats its purpose. Before replacing your rangehood, there are several things to check that can restore full performance. Here's a step-by-step guide.
How Rangehoods Work
A rangehood extracts air from above the cooktop using a fan motor and either vents it outside through a duct (ducted rangehood) or passes it through a charcoal filter and recirculates it back into the kitchen (recirculating rangehood). Understanding which type you have is key to diagnosing problems.
Problem: Weak Suction / Poor Extraction
Check 1: Clogged Grease Filter
This is the most common cause of poor extraction. Grease filters (the metal mesh filters you can see on the underside of the rangehood) trap grease from cooking. Over time they become clogged and restrict airflow significantly.
Fix: Remove the grease filters. Most slide or clip out easily. Wash them in hot soapy water or run them through the dishwasher on a hot cycle. Rinse and dry completely before reinstalling. This should be done every 1–3 months depending on how much you cook.
Check 2: Clogged Charcoal Filter (Recirculating Only)
If you have a recirculating rangehood, it also has charcoal (carbon) filters behind the grease filters. Unlike grease filters, charcoal filters cannot be cleaned — they must be replaced.
Fix: Replace the charcoal filters. These are available from most appliance spare parts stores and online. Replace every 3–6 months.
Check 3: Blocked Ductwork (Ducted Only)
If you have a ducted rangehood, the duct that runs from the rangehood to outside can become partially blocked with grease buildup or a bird's nest or other debris at the external vent.
Fix: Check the external duct outlet (usually on the roof or external wall). Clear any visible blockage. For internal duct cleaning, a professional duct cleaner may be needed.
Check 4: Incorrect Fan Speed Setting
Simple but worth checking — make sure the rangehood is set to the highest fan speed when heavily cooking.
Check 5: Fan Motor Failing
If the grease filters and charcoal filters are clean but suction is still weak, the fan motor may be deteriorating. Fan motors do wear out over time, particularly in older rangehoods used heavily.
Fix: This requires professional repair or rangehood replacement. Fan motors can sometimes be replaced, but in older rangehoods it's often more cost-effective to replace the whole unit.
Problem: Rangehood Is Noisy
A noisy rangehood is often caused by clogged grease filters (the fan has to work harder). Clean the filters first. If noise persists after cleaning, the fan blade may be loose or the motor bearings may be worn.
Problem: Lights Not Working
Rangehood globes are often standard halogen or LED globes that can be replaced. Check your manual for the correct globe type. Some rangehoods use proprietary LED modules that need to be sourced from the manufacturer.
When to Replace Your Rangehood
If your rangehood is more than 8–10 years old, the motor is noisy or weak, and cleaning the filters doesn't help, replacement is usually the most practical option. Modern rangehoods are quieter, more powerful and more energy-efficient than older models.
Oceania Appliances stocks rangehoods from leading brands. Visit us at 2/14 Centre Place, Wetherill Park — open 7 days, 10am to 8pm. Free delivery across Sydney.