Tumble Dryer Not Heating Up

Blocked Lint Filter

The most common cause. A blocked lint filter restricts airflow through the machine, preventing the heating system from working correctly. The lint filter must be cleaned after every single drying cycle without exception.

Blocked Condenser (condenser and heat pump dryers only)

A clogged condenser unit restricts airflow and prevents the machine from generating or retaining heat effectively. The condenser should be cleaned regularly — check your manual for the recommended frequency.

Full Water Tank (condenser and heat pump dryers only)

A full condensate water tank can prevent the dryer from operating correctly and contribute to heating faults. Always empty the tank before starting a new cycle.

Tripped Thermal Overload Cutout

If the dryer has overheated — usually due to a blocked filter — the thermal overload cutout trips to protect the appliance. On some vented dryers this is a resettable button located at the back of the machine.

Faulty Heating Element (vented and condenser dryers only)

A failed heating element will prevent the machine from generating any heat at all. This is an internal component that requires professional diagnosis and replacement.

Faulty Heat Pump (heat pump dryers only)

A fault within the sealed heat pump circuit will prevent the machine from heating. This requires specialist professional diagnosis as the sealed circuit cannot be accessed at home.

Faulty Thermostat or Temperature Sensor

A faulty thermostat can cause the machine to cut out the heat prematurely or not activate it at all. Requires professional testing and replacement.

Clean the Lint Filter

Remove the lint filter and clean it thoroughly. Remove all fluff and debris and rinse under water if needed. Allow it to dry completely before refitting. This must be done after every single cycle.

Empty the Water Tank

Pull out the condensate water tank, empty it fully and refit it firmly. A full tank can prevent the dryer from completing or starting the heating phase of the cycle.

Clean the Condenser

Remove the condenser unit, rinse it thoroughly under cold running water until the water runs clear, allow it to dry completely and refit it firmly before restarting the machine.

Check the Thermal Overload Cutout

On some vented dryers there is a small reset button on the back of the machine. If the machine has overheated, this button will have popped out — press it back in to reset. Check your user manual for the location on your specific model.

Reset the Machine

Unplug the appliance from the mains and wait at least two minutes. Plug back in and retry the cycle. This can clear temporary electronic faults affecting the heating circuit.