Tumble dryer won’t start

Step-by-Step Diagnosis

1. Check for power at the socket.

   If indicator lights are working, the machine has power – skip to step 3. If nothing works at all, plug a different appliance or lamp into the same socket. If that works, the socket is fine and the fault is with the dryer. If nothing works in that socket, the socket itself has lost power – check the consumer unit for a tripped breaker.

2. Check the fuse in the plug.

   The fuse should be 13 amp. Test it with a continuity meter, or swap it for a known working 13 amp fuse. If replacing the fuse gets the dryer running, keep a close eye on it over the next few uses. A fuse that blows again – immediately or during a cycle – indicates an underlying fault that needs an engineer. A fuse that blew with an audible bang from the dryer needs proper investigation before the machine is used again.

3. Check for warning lights or alerts.

   On condenser dryers, check whether the condensate drawer is full. Most machines will not start a cycle with a full drawer. Empty it and try again. Also check whether a filter warning light is showing – on some condenser dryers a blocked filter prevents the machine from starting.

4. Check the door catch and microswitch.

   The most common cause of a tumble dryer with power that will not start is a failed door microswitch or a broken door catch. The door catch is typically a small plastic peg on the door that passes through the casing and presses a microswitch when the door is closed. If the peg is broken, bent, or no longer reaching the switch, the machine will not start. Inspect the door catch visually – if it looks intact, the microswitch itself may need testing with a continuity meter.

5. Check the start button or on/off switch.

   If the machine has a main on/off switch or a start button, check whether it feels and operates normally. A button that no longer clicks when pressed, or a switch that feels loose or intermittent, may have failed internally. This requires opening the control panel to test.

Machine Has Power But Only Hums

If the machine clearly has power – lights on, drum does not turn, produces a gentle hum when started – the motor is receiving power but cannot rotate. There are two main causes.

Faulty start capacitor (most likely)
Many tumble dryer motors use a start capacitor to provide the initial surge of power needed to get the motor turning. If the capacitor fails, the motor receives running power but cannot overcome the starting resistance. The motor hums but does not turn. The capacitor should be tested or replaced by an engineer – do not attempt this without confirming the capacitor has been safely discharged first.

Seized drum or motor
If the drum or motor bearings have seized, the motor will hum under load without turning. Try opening the door and turning the drum by hand – if it is completely stiff or will not move at all, a mechanical seizure is the cause. See our guide on tumble dryer drum not turning for more on this fault.

Do not investigate capacitor faults without knowing the risks

What appears to be a start capacitor could be a suppressor filter – these are different components and need different handling. Capacitors hold electrical charge that can cause a serious shock even after unplugging. This fault is best left to an engineer unless you have specific knowledge of capacitor diagnosis and discharge procedures.

Related Guides

Tumble Dryer Drum Not Turning
Belt, motor, and capacitor faults that cause the drum to stop rotating when the machine is running.


Tumble Dryer Not Heating
TOC, thermostat, and heating element faults causing a dryer that runs but produces no heat.


Electric Shock Risk From Unplugged Appliances
Why capacitors retain a dangerous charge after unplugging and how long to wait before touching internal components.


DIY Appliance Repair Safety
Essential safety rules before working on any large appliance.

Frequently Asked Questions