Bosch Dryer Error Code E12 — Drum Motor Relay Fault
What this means
Error E12 indicates the motor relay on the electronic control board has malfunctioned. This relay switches power to the drum motor. When it fails, the motor will not receive power even though the rest of the dryer may appear to work normally.
Step-by-step fix
3 stepsPower cycle the dryer
Unplug for 10 minutes and try again.
Check for clicking
When you press start, listen for a relay click on the control board. No click suggests the relay has failed.
Replace the control board
The motor relay is integrated into the main control board and cannot be repaired separately. The entire board needs replacement.
When to call a professional
Control board replacement is a professional repair. Incorrect installation can cause further damage.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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