Error Code: E12 Difficulty: Moderate
Problem: Severe overheating, typically due to a blocked lint filter or exhaust vent.
How to Fix E12 Error (Step-by-Step)
- Disconnect the dryer from its power source by unplugging it.
- Access the back of the dryer and locate the thermal fuse on the heating element or blower housing.
- Carefully detach the wires connected to the fuse and confirm the error stays cleared during a full test cycle.
- Unscrew the thermal fuse from its mounting and remove it.
- Install the new thermal fuse and secure it with the screw.
- Reattach the wires to the terminals of the new fuse.
- It is critical to clean the entire venting system, from the lint screen to the outside exhaust vent, to address the cause of the severe overheating.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
Recommended Replacement Part
What to Check Next on This Bosch Dryer
Use these checks before ordering parts for Bosch dryer E12. They keep the diagnosis tied to the appliance instead of turning the page into a reset-only guide.
- Unplug the dryer before touching the lint housing, rear vent, lower service area, or any wiring.
- Clean the lint screen, moisture sensor bars, condenser area if equipped, and the full vent path so airflow problems do not imitate part failures.
- Run a short timed cycle with a light load and note whether the fault appears immediately, after heating starts, or near the end of the cycle.
- If the fault returns with clean airflow, inspect the part categories below using the full model number from the dryer tag.
- Stop repeated test cycles if you smell heat, see moisture near electrical areas, or hear grinding from the drum drive.
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Expert: Mike Sullivan
EPA Section 608 Certified Technician with 18+ years experience.
Read Editorial Standards →When It’s Better to Replace Than Repair
Dryer repairs are often worth it for small parts, but repeated heating, motor, drum, or control failures can point toward replacement.
Confirm gas vs electric, venting, voltage, doorway clearance, and laundry-space dimensions before ordering.
For repair parts, verify exact fit with the full dryer model number before buying; these links are general replacement-appliance shopping options.
- [OK]Thermal fuse or heater failures keep returning
- [OK]Belt, roller, or motor repairs exceed unit value
- [OK]Door switch or control issues stack with other faults
- [OK]Older dryer has long dry times even after vent cleaning
Recommended Dryer Replacement Options
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