Safety first: Unplug the dryer and allow it to cool fully before working on it.

Clean all filters: Remove and thoroughly clean the lint filter and any secondary filters. Ensure they are dry before refitting.
Clean condenser and ducts: On condenser models, remove and wash the condenser. On vented models, check the vent hose for kinks, crushing, or lint build-up. Clean or replace the hose if necessary.
Check installation clearance: Ensure the dryer is not pushed tightly against a wall, blocking air inlets or outlets. Maintain recommended clearances from the user manual.
Inspect exhaust thermostats: Access the exhaust duct (usually at the rear) and locate thermostats/thermal cut-outs. Test for continuity. Replace any open thermostats that are not resettable.
Test run: After cleaning and any thermostat replacement, run a short warm cycle and monitor for E12. If it reoccurs quickly, the NTC or control PCB may be misreading temperature and require professional service.

Bush dryer displays E12 and may stop heating or terminate cycles prematurely.

Possible Causes