Error Code: F12 Difficulty: Hard
Problem: Electronics problem; the unit may need to be dried.
How to Fix F12 Error (Step-by-Step)
- Disconnect the dryer from the wall outlet to ensure your safety.
- Relocate the dryer to a dry, well-ventilated space. Leave the door ajar for at least 24 to 48 hours. This allows any potential moisture inside the electronic components to fully evaporate.
- After the waiting period, plug the dryer back into the power source and try starting a new cycle to see if the error is resolved.
- A service will need to access and test the main control board using a multimeter. A faulty board is a common cause for this error.
- If the control board is defective, the service will need to carefully disconnect all wiring harnesses and remove it to install a new one.
- The service will also inspect the drive motor and its connections, as a fault in the motor can send an error to the control board. If the motor is found to be the cause, it will be replaced.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.
What to Check Next on This Bosch Dryer
Use these checks before ordering parts for Bosch dryer F12. 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.
Recommended Parts to Check
Bosch dryer part numbers vary by model. These are model-number-safe part-category searches, not universal fit claims.
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Dryer lint screenCommon replacement category: lint filterFit note: Exact OEM part number varies by full model number. Confirm compatibility before buying.Why check it: Start with lint restrictions when heating, airflow, or maintenance warnings appear.
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Dryer thermal fuseCommon replacement category: thermal protectionFit note: Exact OEM part number varies by full model number. Confirm compatibility before buying.Why check it: Common safety device to inspect after overheating or no-heat symptoms.
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Dryer drum beltCommon replacement category: drive systemFit note: Exact OEM part number varies by full model number. Confirm compatibility before buying.Why check it: Worth checking when the dryer tumbles poorly, stalls, or makes drive noise.
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Dryer moisture sensorCommon replacement category: sensor circuitFit note: Exact OEM part number varies by full model number. Confirm compatibility before buying.Why check it: Useful category to verify when dryness or care/maintenance messages persist.
Before ordering: match the part to the complete model number on the appliance tag.
More options (for a better recommendation)
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Expert: Mike Sullivan
EPA Section 608 Certified Technician with 18+ years experience.
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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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