Rangehoods don't usually fail dramatically — they tend to decline gradually, and because it's a slow process, many Australian households are cooking under a rangehood that's no longer doing its job properly without really noticing. If you're experiencing any of the following signs, it's worth taking a closer look at whether your rangehood needs repair, servicing, or replacement.
1. Cooking Smells Linger Long After You've Finished Cooking
A rangehood in good working order should clear the air in your kitchen within five to ten minutes of finishing cooking. If cooking smells — particularly from fish, garlic, fried food, or heavily spiced dishes — are hanging around for thirty minutes or more, your rangehood isn't extracting effectively. The cause could be as simple as clogged filters that need cleaning, or a carbon filter that needs replacing in a recirculating model. But if cleaning the filters doesn't resolve the problem, it may indicate the motor has lost power or the ducting has developed a restriction.
2. Visible Grease Buildup on Kitchen Surfaces
One of the practical functions of a rangehood is to capture airborne grease before it settles on your cabinets, splashback, walls, and ceiling. If you're noticing a sticky or greasy film building up on surfaces near the cooktop faster than usual, or surfaces further from the cooktop are becoming greasier than they used to, your rangehood's capture efficiency has likely declined. Again, start by cleaning the filters — but if the grease migration continues with clean filters, the hood itself may be underperforming.
3. Unusual Noise During Operation
Rangehoods produce some noise during operation, and most have multiple fan speeds with varying sound levels. What you're listening for is any new or unusual sound that has appeared or worsened over time: rattling, vibrating, grinding, or a significant increase in overall noise level. A rattling sound often indicates that a filter isn't seated properly or that a component inside the hood has come loose. A grinding or scraping noise typically suggests a problem with the fan motor or motor bearings. If noise-related problems persist after re-seating the filters, the motor likely needs professional inspection.
4. The Fan No Longer Runs at Full Speed
If your rangehood's highest fan speed seems noticeably weaker than it used to — air that once visibly moved a hand held above the cooktop now produces little airflow — the motor is declining. This can happen gradually over years of use, particularly in rangehoods that weren't cleaned regularly and have accumulated grease in the motor housing. A weaker motor means lower extraction efficiency regardless of what other maintenance you perform.
5. Lights That Don't Work or Flicker
Most rangehoods include one or more lights to illuminate the cooktop. Failed or flickering lights aren't just inconvenient — they're often one of the early signs of electrical deterioration in an older unit. Before concluding the unit needs replacing, it's worth checking whether the globe or LED module is simply a replaceable component (many are) or whether the wiring shows signs of damage. Older halogen globes in rangehoods often need replacing after a few years of use; LED replacements are widely available and draw much less power.
6. The Unit Is More Than 15 Years Old
Rangehoods don't have a fixed lifespan, and a well-maintained unit can last twenty years or more. But realistically, a rangehood that's fifteen-plus years old is likely operating with motor efficiency that's significantly lower than modern equivalents, and may lack features like variable speed control, LED lighting, automatic timer functions, or smart connectivity that are now standard at accessible price points. If your older rangehood is experiencing any of the symptoms above and a service quote comes back expensive, the cost-benefit case for replacement is usually clear.
7. Your Cooking Style Has Changed
This one isn't about the rangehood failing — it's about the right tool for the job. If you've upgraded from a 60cm electric cooktop to a 90cm gas cooktop, or you've taken up wok cooking, stir-frying, or entertaining more frequently, a rangehood that was adequate for your old cooking habits may simply not have the extraction power your new cooking style demands. Similarly, if you've moved from a single kitchen to an open-plan layout, the demands on your rangehood have increased significantly. Upgrading your rangehood when your cooktop or kitchen layout changes is just good sense.
When evaluating a replacement, use the sizing and extraction power guidelines covered in our rangehood sizing guide, and match the type (ducted or recirculating) to your installation setup. A new rangehood is far less expensive than the cumulative effect of years of inadequate ventilation on your cabinetry, walls, and indoor air quality.