Bosch Dryer Error Code E09 — Heating Element Relay Fault
What this means
Error E09 means the relay on the main control board that switches the heating element on and off has malfunctioned. The relay may be stuck open (no heat) or stuck closed (continuous heat, which is a safety hazard). This is a control board issue rather than a heating element problem.
Step-by-step fix
3 stepsPower off immediately
If the dryer is producing heat continuously or not shutting off, unplug it right away. A stuck relay is a fire hazard.
Do not use the dryer until this is repaired.
Power cycle
Unplug for 10 minutes and try again. Occasionally the relay can be temporarily stuck.
Replace the control board
If the error returns, the main electronic control board needs replacement since the relay is integrated into the board.
Note your model number before ordering — control boards are model-specific.
When to call a professional
A stuck heating relay is a safety concern. Professional replacement of the control board is strongly recommended.
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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