Miele Oven Error Code F134

Error code F134 on a Miele oven indicates that the cavity temperature sensor is reporting a temperature reading that exceeds the expected upper threshold for the oven's operating range. The control electronics continuously monitor the signal from the oven temperature sensor (also called the cavity sensor or NTC sensor) and compare it against programmed limits. When the incoming signal corresponds to a temperature value that is implausibly high, the control board interprets this as a fault condition and displays F134 to prevent potential damage or unsafe operation.

There are two primary root causes for this fault. First, the cavity temperature sensor itself may be defective, producing a runaway or out-of-range resistance or voltage signal even when the actual oven cavity is at a normal temperature. Second, the control or display electronic board may be malfunctioning and misreading a valid sensor signal as being too high. Distinguishing between these two components is the core diagnostic task when this code appears.

The recommended first step is to allow the appliance to cool down completely before performing any inspection or measurement. This is important both for safety and because a genuinely overheated cavity could trigger the code legitimately, in which case cooling and restarting may clear it. If the code returns after the oven has fully cooled, the fault lies with either the temperature sensor or the control electronics, and further testing of each component is required to determine which needs replacement.