Thermador Oven Error Code E115 — Convection Fan Motor Fault
What this means
Error E115 on Thermador ovens indicates the convection fan motor has failed or is running below the required RPM. Thermador convection ovens (including True Convection models) rely on the fan to circulate hot air evenly for consistent cooking results. When the fan motor fails, the oven may still heat but with poor heat distribution, leading to uneven cooking. Causes include a seized fan motor bearing, a cracked fan blade that is causing imbalance, a failed motor winding, or a wiring issue to the motor.
Alternate codes: E-115
Step-by-step fix
3 stepsCheck the fan blade
Turn off the oven breaker. Open the oven door and locate the convection fan — it is behind the round fan cover on the rear wall of the oven cavity. Remove the cover (usually held by screws or a center nut). Inspect the fan blade for cracks, warping, or damage. Try spinning the blade by hand — it should rotate smoothly.
Over time, fan blades can become coated with grease and food residue, which throws them off balance and strains the motor.
Test the fan motor
With the fan cover and blade removed, disconnect the motor wire harness (accessed from behind the oven). Test the motor windings for continuity — a good motor reads 20–60 ohms. An OL reading means the winding is broken. Also try spinning the motor shaft — stiffness indicates seized bearings.
Even if the motor has continuity, seized bearings will prevent it from reaching proper RPM. Replace the motor if it is stiff.
Replace the convection fan motor
Remove the motor from behind the oven rear wall (accessed by removing the back panel). Disconnect the wiring, remove mounting bolts, and pull the motor out. Install the new motor, reattach the fan blade and cover, and restore power. Test with a convection bake cycle.
When reinstalling the fan blade, ensure it is centered and secure — a loose blade will vibrate and can trigger E115 again.
When to call a professional
On Thermador wall ovens, accessing the convection motor from behind can be challenging in tight cabinet installations. If you cannot reach the motor safely, have a Thermador technician handle it.
Related error codes
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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