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.
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)
What You Can Fix Yourself
- Removing and washing grease filters in hot soapy water
- Replacing a blown light bulb
- Checking the external duct flap opens freely
What Needs a Technician
- Motor replacement or repair
- Any wiring or switch fault
- Internal control board issues
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.
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.
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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.