Thermador Range Hood FAN-FAIL Error: Fan Motor Not Running
Thermador range hood FAN-FAIL error indicates fan motor not running. Stop using the appliance and call a Thermador-certified technician immediately for diagnosis. What Does Thermador Range Hood FAN-FAIL Mean? FAN-FAIL describes the condition on a Thermador Professional or Masterpiece range hood where the blower motor is not running despite the fan speed controls being active. […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. A range hood with no fan operation provides no ventilation protection. Operating a cooking surface directly below a non-functioning hood allows grease vapors to accumulate on cabinet surfaces and increases fire risk from unvented cooking grease. Schedule service before heavy cooking.
Can I reset the code?
Yes. A circuit breaker reset can restore fan operation if the hood's control board entered a soft lockout state. A genuinely failed motor, capacitor, or control board will not respond to a reset.
When to stop immediately?
Stop if you notice: No fan response after breaker reset on any speed setting, Burning smell from inside the blower housing.
Symptoms You May Notice
No airflow from the hood on any fan speed setting
Switching through all speed settings — from low through boost on Thermador Professional hoods — produces no movement of air at the grease filter surface.
Fan speed lights illuminate but no motor noise is audible
The control panel LEDs confirm the fan speed command is registered, but the blower compartment is silent where it normally produces a distinct motor hum.
Cooking odors and steam accumulate in the kitchen during use
With the hood running but producing no airflow, grease vapors, steam, and cooking smoke fill the kitchen rather than being drawn up through the ductwork.
Possible Causes
Failed blower motor
The blower motor winding has burned out or the motor bearings have seized, preventing the impeller from turning when the control board commands fan operation.
Requires ProfessionalFailed motor run capacitor
The run capacitor that helps start the blower motor on each cycle has failed open. The motor tries to start, hums briefly, then stalls — with a failed capacitor, the motor cannot develop starting torque.
Requires ProfessionalFaulty fan speed control board or switch
The control module that routes voltage to the blower motor at each speed setting has failed, so no voltage reaches the motor even though the display shows a selected speed.
Requires ProfessionalSafe Checks You Can Do
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1
Reset the hood at the circuit breaker
Switch the circuit breaker serving the range hood off for 30 seconds and restore power. On Thermador Professional and Masterpiece hoods with electronic controls, a power reset reinitializes the control board and can clear a soft lockout that prevented motor startup.
If the motor starts briefly after the reset and then stops, the run capacitor is likely failing. A capacitor that can no longer hold charge will allow the motor to spin for a moment on startup voltage but cannot sustain rotation.
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2
Listen carefully at all three fan speeds
After the reset, switch through each fan speed setting and listen at the underside of the hood for any sound — even a faint hum or brief rotation attempt. Any sound from the motor area confirms the motor is receiving voltage and the control board is functional, narrowing the fault to the motor or capacitor.
Complete silence at all speed settings points to a control board or wiring fault. A hum without rotation points to a seized motor or failed capacitor. Both require a technician, but knowing which symptom you have helps the technician arrive with the right part.
When to Call a Professional
Contact a qualified technician if:
- Motor shows no rotation even when confirmed to have power at the connector
- Run capacitor measures outside its rated microfarad range on an LCR meter
- Control board outputs no voltage to the motor terminals on any speed setting
Need Professional Help?
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