What F30 Means
F30 on an older Bosch Evolution range means the control module sees an open circuit where the oven temperature sensor should be. The service manual gives a usable figure: a healthy sensor and harness measure between 1080 and 1110 ohms at room temperature, read across the two violet wires at the control module connector. If that reading is correct at the module the fault is the module; if it is open there but correct at the sensor, the harness or its connector has failed.
Common Causes of F30
- Oven temperature sensor probe open circuit
- Broken wire or faulty connector in the sensor harness
- Control module unable to read the circuit
🔧 One Safe Check You Can Try
There is no safe home measurement, but the manual's own caution is worth repeating: never assume the sensor has failed because the code says sensor. It may simply be unplugged or have a broken wire, and both are cheaper than a probe.
⚠ Why You Shouldn't Go Further Than That
- The manual makes the point itself, that a fault code never proves a part has failed, and the same reading can mean three different repairs.
- The measurement is taken at the control module connector, which sits behind the fascia of a range that must be drawn forward.
- On a dual fuel model the gas supply valve at the appliance must be closed before the range is moved or the fascia opened.
- A probe fitted at a different depth in the cavity wall reads differently even when the part itself is correct.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.