Jenn-Air Range Error Code 4d41

Error code 4d41 on a Jenn-Air range indicates that the control board has detected an overspeed condition in the cooling fan during an active cook or clean cycle. The cooling fan is responsible for drawing ambient air across the electronic control board and other heat-sensitive components to prevent thermal damage during high-temperature operation. An overspeed condition means the fan is spinning faster than the parameters the control expects, which is the opposite of the more common underspeed or failure-to-run fault.

The control board monitors fan motor speed through a tachometer feedback signal. When this signal indicates RPM exceeding the programmed threshold, the 4d41 code is triggered. This can result from a shorted or malfunctioning fan motor whose speed regulation circuit has failed, a fault in the tachometer feedback loop sending erroneous high-speed signals to the board, or a control board that is misreading the signal due to its own internal component failure.

This fault is most likely to appear during self-clean cycles when the oven operates at maximum temperatures and the cooling fan runs at sustained high speed. Identifying whether the fan is physically spinning too fast or whether the fault is a sensor or control board misread is the key diagnostic distinction. A fan motor with a failed internal speed regulator will often spin at full uncontrolled speed regardless of the commanded duty cycle.