Bosch Dryer Error Code E:12

E:12 indicates a Stage 2 overheating fault during the fluffing cycle. The dryer's control board detected that the heater temperature rose more than 7 degrees Celsius within 5 seconds, and this occurred 10 times in a row. This pattern almost always points to blocked airflow caused by a clogged lint filter, dirty condenser, or obstructed internal air routes. The dryer shuts down the heating system automatically to prevent component damage.

No, you should not continue running the dryer while E:12 is active. The error means the dryer has detected repeated rapid overheating events and has shut down to protect itself. Running the machine in this condition risks damaging internal components and could create a fire hazard if the underlying airflow blockage is not resolved first.

If the fix is simply cleaning the lint filter, condenser, and air routes, there is no parts cost involved and you can do it yourself at no charge. If a faulty temperature sensor or other component is confirmed as the cause after cleaning, parts and labor for a professional repair typically range from $100 to $250 depending on the specific part needed and local labor rates.

Start by cleaning the fluff filter, the condenser unit, and all accessible internal air passages. Empty the condensate container if your model uses one. After cleaning all components, run a short cycle to see if the error clears. If E:12 returns after a thorough cleaning, a temperature sensor or NTC thermistor may need to be tested and potentially replaced.

A power reset may clear the fault code temporarily, but the error will return if the root cause has not been addressed. The control board triggers E:12 based on a repeated pattern of temperature spikes, so as long as a blockage restricts airflow, the dryer will overheat again and re-enter the fault. Always clean the filter, condenser, and air routes before attempting a reset.