Kitchen Chimney Not Working? Causes and Safe Checks
When a kitchen chimney stops working, the symptom usually points to the cause. A chimney that is completely dead, lights included, most often has a power, switch, control board or wiring fault rather than a failed motor. A motor that hums without turning commonly has a failed capacitor, a fan jammed by grease or seized bearings. Missing speeds point to a switch or the control board, and a panel that will not respond is often grease or moisture on it, a worn switch or a faulty board. Do the safe checks below first; anything inside the chimney needs a repair check.
Safe checks before you call
Do these with the hob off. None of them involve opening the chimney.
- Socket and MCB. Check that the chimney’s socket is switched on and the MCB has not tripped.
- Plug. Check the plug is firmly in. A loose plug can stop a chimney switching on.
- No extension board. A chimney should run from a three-pin earthed socket, not an extension board. If the socket is loose, scorched or not earthed, get it fixed by a licensed electrician.
- Lights. Note whether the lights still work. If the lights are off too, the cause is usually the power supply, wiring or control board, not the motor.
- Filters. If the chimney runs but pulls weakly, wash the filters first. See weak chimney suction.
- Video. Record a short video, with sound, of what happens when you switch it on, and send it on WhatsApp to +91 93477 37176.
Do not open the motor housing or control panel yourself. If you see sparks or smell burning, switch the chimney off at the socket.
What the symptom usually means
Several faults can produce the same symptom, which is why a chimney is tested on site before anything is replaced.
| What you notice | Common causes | What to do |
|---|---|---|
| Completely dead, lights also off | No power at the socket or a tripped MCB; a loose plug; a faulty switch panel, control board or internal wiring. Usually not the motor itself | Check the socket and MCB, then a repair check |
| Hums, but the fan does not turn | A weak or failed capacitor; a fan jammed by grease; seized bearings | Switch it off at the socket to avoid overheating the motor, then a repair check |
| Starts only if the fan is pushed by hand | A weak capacitor; bearings starting to seize | Repair check |
| Only some speeds work | A faulty speed switch or control board; a fault in the motor winding | Repair check |
| Buttons or touch panel dead or erratic | Grease or moisture on the panel; a worn switch; a faulty control board | Repair check |
| Lights not working | A failed bulb or LED strip; a loose connector; the light switch | Repair check |
| Auto-clean not working | A faulty heating element or control; a full or missing oil cup | Check the oil cup is fitted and emptied, then a repair check |
| Gets very hot, smells of burning or trips the power | Damage to the motor winding or a short circuit | Switch off at the socket and do not keep using it |
| Runs, but suction is weak | Grease in the filters or fan; a restricted duct; a motor losing speed | See weak chimney suction |
| Runs, but is noisy | Worn bearings; grease on the fan blades; something touching the fan; loose internal screws | A deep cleaning if grease is the cause; worn bearings need a repair |
These are common causes, not a diagnosis.
Push-button, touch-panel and BLDC chimneys
The likely fault also depends on the kind of chimney you have.
- Push-button chimneys with a conventional motor. A dead speed is usually a switch, and a humming motor is usually a capacitor, which is a small part.
- Touch-panel chimneys. A dead speed or a dead panel is a control board repair. Oil or moisture behind the glass is a common cause.
- BLDC (inverter) chimneys. The motor is driven by a driver or inverter board, and the electronics fail more often than the motor itself. A BLDC chimney that is completely dead is often the board, so the board is tested before any motor is condemned.
Motor symptoms, testing and BLDC boards are covered in more detail on the chimney motor repair page.
When it is not a fault
- A blinking auto-clean light. On some auto-clean chimneys the light is a reminder that comes on after a set number of running hours to say a cleaning cycle is due. It does not mean something has failed.
- A clean-filter reminder. On models that have one, it has to be reset from the control panel after the filters are washed. A reminder that will not reset points to the panel.
- A full oil collector. Auto-clean drains loosened oil into a collector cup, and the cup needs emptying.
What a repair visit involves
- Describe the problem. Tell us the brand, model and what is happening. A video helps.
- Test on site. The technician checks power, controls, fan, motor and duct to find the actual cause.
- Cause and cost. You are told what has failed, what the repair involves and what it costs, including any part.
- You decide. The repair goes ahead only if you agree.
- Repair and test. The fault is fixed or the part replaced, then suction, all speeds, lights and controls are checked with you.
Before anyone travels, you get a probable cause, a price range and the visit charge, which covers travel to your home. If you go ahead with the work, the visit charge is adjusted into the bill. See how our charges work, or the chimney repair page.
Repair or replace?
A failed capacitor is a small part, and worn bearings can sometimes be serviced. A burnt winding usually means a new motor. What decides it is which part has failed, whether a matching part is available for your model, the age and condition of the chimney, and the repair cost compared with replacing the chimney. If a repair is not worth it for an old chimney, you will be told so.
We are an independent service provider, not an authorised service centre for any brand. If your chimney is still under the manufacturer’s warranty, contact the brand first; outside repairs can affect that warranty. See the chimney brands we service.
Questions about a chimney that is not working
Why is my chimney not switching on at all?
Check that the socket is switched on, the MCB has not tripped and the plug is firmly in. If there is still nothing, the cause is usually a faulty switch panel, control board or internal wiring rather than the motor, and it needs a repair check. On BLDC chimneys, a completely dead hood is often the driver board.
My chimney hums but the fan does not spin. What is wrong?
A hum with the fan not turning commonly points to a failed capacitor, a fan jammed by grease or seized motor bearings. Switch it off at the socket to avoid overheating the motor and book a repair check.
Why does only one speed work?
A faulty speed switch or control board, or a fault in the motor winding. On push-button chimneys a dead speed is usually the switch; on touch-panel chimneys it is a board repair.
Why has the touch panel stopped responding?
The cause may be grease or moisture on the panel, a worn switch or a faulty control board. The technician checks which, and whether a replacement board is available for your model.
Is it safe to keep using a chimney that is not working properly?
Not if it gets very hot, smells of burning or trips the power: switch it off at the socket and do not keep using it. A motor that hums without turning should also be switched off so it does not overheat.