Tumble Dryer Overheating

Blocked Lint Filter

The most common cause by far. A blocked filter prevents hot air from flowing through the machine, causing temperatures to rise rapidly. The lint filter must be cleaned after every single drying cycle without exception.

Blocked Condenser (condenser and heat pump dryers only)

A clogged condenser restricts airflow through the machine and prevents heat from being dissipated correctly, causing temperatures to build up during the cycle.

Blocked Exhaust Duct (vented dryers only)

A kinked, crushed or blocked exhaust duct prevents hot damp air from escaping the machine. The duct should be as short and straight as possible with no sharp bends. A blocked duct is also a fire risk.

Inadequate Ventilation Around the Machine

All tumble dryers require adequate ventilation around them to operate safely. If the machine is enclosed in a tight cupboard with no airflow, it will overheat during every cycle.

Faulty Thermostat

A faulty thermostat may fail to cut off the heating element at the correct temperature, allowing the machine to continue heating beyond safe limits. Requires professional diagnosis and replacement.

Clean the Lint Filter

Remove the lint filter and clean it thoroughly. This is the single most important maintenance step. Clean it after every single cycle to prevent airflow restriction and overheating.

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 firmly before restarting the machine.

Check the Exhaust Duct

Inspect the exhaust duct for any kinks, blockages or crushing. Ensure it is routed as directly as possible to the outside with no sharp bends. Clean out any lint build-up inside the duct.

Check Ventilation Around the Machine

Ensure there is adequate space around the machine for air to circulate. Do not install the machine in a fully enclosed space without ventilation — this will cause overheating on every cycle.