Quick Answer
The five most common reasons a rangehood isn't working properly are saturated grease filters, a blocked duct, a failed motor, an electrical fault, or — for the lights specifically — a blown bulb or faulty switch.
Weak suction and no power at all are different faults with different causes — identifying which one you have narrows down the fix quickly.
Weak suction, no lights, or strange smells from your rangehood usually point to one of a small number of common causes. Here's how to tell which one you're dealing with — and which ones you can fix yourself before calling in a licensed range hood repair technician.
This guide covers the five most common faults, what's safe to check yourself, the difference between ducted and recirculating rangehoods when something goes wrong, and when a rangehood fault becomes a genuine safety issue rather than just an inconvenience.
5 Common Causes
- Saturated grease filters blocking airflow — the most common cause of weak suction
- Blocked external duct on ducted models
- Failed or weakening motor causing reduced or no suction
- Electrical fault affecting the fan, lights, or both
- Blown bulb or faulty switch (lights only)
Ducted vs Recirculating: Why the Cause Differs
A ducted rangehood pushes air outside through wall or roof ducting, so a weak-suction complaint on a ducted model often traces back to the external duct itself — a blocked or crushed duct run, a stuck external flap, or a duct that's come loose behind the wall during other renovation work. A recirculating rangehood, by contrast, has no external duct at all — it filters air through a charcoal filter and returns it to the kitchen, so weak suction on a recirculating model points almost entirely to the grease filter and charcoal filter rather than any ductwork. Knowing which type you have narrows the likely cause down immediately.
What You Can Fix Yourself
- Removing and washing grease filters in hot soapy water — do this every 2–4 weeks in a household that cooks daily
- Replacing a blown light bulb
- Checking the external duct flap opens freely (ducted models)
- Replacing the charcoal filter on a recirculating model — usually every 3–6 months, as it can't be washed and simply stops absorbing odour once saturated
What Needs a Technician
- Motor replacement or repair
- Any wiring or switch fault
- Internal control board issues
- A duct that's disconnected, crushed, or blocked somewhere inside the wall or ceiling cavity
When It's More Than an Inconvenience
A rangehood that's stopped extracting isn't usually dangerous on its own, but two specific symptoms are worth treating more seriously: a burning smell coming from the unit itself (rather than from cooking), and a motor that feels hot to the touch or is making a grinding or straining noise under load. Both can indicate a failing motor or an electrical fault, and continuing to run the unit in that state — especially above a gas cooktop, where grease build-up plus an electrical fault is a genuine fire risk — is not worth the risk of a same-day repair cost. Turn it off at the switch and book a technician rather than continuing to use it.
What's Safe to Check Yourself vs When to Call a Pro
Safe to Check Yourself
- Remove and wash grease filters in hot soapy water
- Replace the charcoal filter if you have a recirculating model and it's been more than 6 months
- Check the external duct flap opens freely while the rangehood runs on high (ducted models)
- Replace a blown bulb
- Note whether the fan, the lights, or both have stopped — this alone helps narrow down an electrical fault from a filter/duct issue
Always Call a Licensed Technician
- Diagnosing and replacing a failing motor
- Any wiring, switch, or control board fault
- Clearing a blockage inside wall or ceiling ductwork
- Diagnosing a burning smell or unusually hot motor
Frequently Asked Questions
Why does my rangehood have weak suction?▼
Saturated grease filters are the most common cause. Remove and wash them in hot soapy water — for ducted models, also check the external vent for blockages; for recirculating models, check whether the charcoal filter is overdue for replacement.
My rangehood lights don't work but the fan does — what's wrong?▼
This is usually a blown bulb or a faulty light switch, rather than a fault affecting the whole unit.
Can a rangehood motor be repaired or does it need replacing?▼
It depends on the fault — a technician can determine whether the motor can be repaired or needs full replacement during diagnosis.
How do I know if my rangehood duct is blocked?▼
Check the external wall vent flap while the rangehood is running on high — it should open with noticeable airflow. If it barely moves, the duct is likely blocked.
How much does it cost to repair a rangehood in Melbourne?▼
Most rangehood repairs fall between $120 and $280 depending on the fault — a filter or light issue sits at the lower end, motor or control board replacement toward the higher end. DP Electric provides a free, fixed quote on arrival before any work begins.
Is a smoking or burning-smell rangehood dangerous?▼
Yes — treat it seriously. Turn the rangehood off at the switch immediately and don't use it again until a licensed technician has inspected it, since a failing motor combined with grease build-up is a genuine fire risk, particularly above a gas cooktop.
How often should I clean or replace rangehood filters?▼
Wash grease filters every 2–4 weeks in a household that cooks daily, and less often in a lighter-use kitchen. Charcoal filters on recirculating models can't be washed and should be replaced every 3–6 months, since they simply stop absorbing odour once saturated rather than showing an obvious visual sign.
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Dishank Patel
Lead Technician & Founder · DP Electric Melbourne
Dishank Patel has over 10 years of hands-on experience repairing household appliances across Melbourne's eastern suburbs. He holds all required Victorian electrical and gas licensing and has personally repaired thousands of appliances across brands including Bosch, Miele, LG, Samsung, and Fisher & Paykel.