Miele Oven Error Code F4

F4 on a Miele oven indicates a fault in the NTC temperature sensor circuit, specifically a short circuit or open circuit condition. The NTC sensor monitors cavity temperature, and when its resistance signal falls outside the expected range, the oven triggers F4 and stops operating. The fault can originate from the sensor itself, the connecting wiring, or the terminal connectors along the circuit.

No, you should not continue using the oven while F4 is active. The error means the oven cannot accurately measure its internal temperature, which removes the control system's ability to prevent overheating. Operating the oven in this condition is a potential safety hazard and could cause damage to food, the oven interior, or surrounding cabinetry.

Repair costs vary depending on the root cause. An NTC sensor replacement is typically the most affordable part involved, and parts plus labor for that repair generally range from around $100 to $250. If the control board is found to be at fault, costs can range from $300 to $600 or more depending on the specific model and labor rates in your area.

A knowledgeable DIYer can perform initial diagnostics such as inspecting wiring for visible damage and reseating connectors. Testing the NTC sensor with a multimeter is also straightforward if you are comfortable with basic electrical measurements. However, replacing the sensor or any wiring components inside the oven does require disassembly and familiarity with appliance repair, so professional service is recommended if you are unsure.

A power reset may temporarily clear the F4 code if the fault was caused by a momentary signal interruption, but the error will return if the underlying problem is not repaired. If the NTC sensor has actually failed or wiring is damaged, the fault will reappear as soon as the oven attempts to read temperature. A reset alone is not a repair.