Thermador Range Error Code F41

The F41 error code on a Thermador range indicates that the upper (or single) oven motorized door latch has failed to complete its locking cycle. This typically surfaces during a self-clean cycle initiation, when the control board commands the latch motor to drive the door lock mechanism into the locked position. If the latch does not reach the locked position within the expected time window, the control registers the fault and halts the cycle. On Sago-platform models, F41 also flags a meat probe calibration failure for the upper oven, making the code relevant to two distinct subsystems depending on the specific operation being performed.

The Power Board is the central component involved in this fault. The P4 connector on the Power Board carries signals related to the latch motor circuit, while the P10 connector is also part of the diagnostic chain. A failure at either connector, whether from loose pins, corrosion, or damaged wiring, can interrupt the signal path and cause the board to misread the latch position. The door latch assembly includes two switches and a common wire; if any of these switches fail to actuate properly, or if the wiring is pinched or shorted by routing issues, the board cannot confirm that the latch has engaged.

Physical causes are common contributors to this fault. The latch motor itself can wear out or seize, preventing mechanical movement entirely. Wiring harness damage, particularly pinched wires near the door hinge area, disrupts switch continuity. In cases where all wiring and switches test correctly, the Power Board itself may have failed and require replacement. On Sago models experiencing the meat probe variant of F41, the probe circuit or its calibration data within the board is the focus of investigation.