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Error code reference

Bosch Range Error Code F30

Open probe connection

Bosch codesBosch range codes

Open probe connection — control module detects an open oven temperature sensor circuit.

First step from the service manual

Check resistance at room temperature at the control module harness connector (two violet wires) and compare to RTD Sensor Resistance chart. If resistance does not match, replace RTD sensor probe. Check sensor wiring harness between control module and sensor probe connector.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F30 means on a Bosch range

The F30 error code on a Bosch range indicates an open circuit in the oven temperature sensor (RTD probe) system. The control module continuously monitors the resistance signal from the RTD (Resistance Temperature Detector) sensor to track oven cavity temperature. When the circuit is broken, the module receives no usable signal and triggers F30 to alert the user and halt oven operation. An open circuit means the electrical path between the control module and the sensor probe is incomplete, which prevents accurate temperature regulation.

The RTD sensor operates on the principle that its resistance changes predictably with temperature. At room temperature, the sensor should read a specific resistance value defined in the RTD Sensor Resistance chart for this model. Diagnostics begin at the control module harness connector, where two violet wires carry the sensor signal. If resistance measured at those terminals does not match the chart values, the sensor probe itself is the likely culprit. If resistance reads correctly at the connector, the fault lies elsewhere in the circuit.

The wiring harness running between the control module and the sensor probe connector is the other primary area of concern. Over time, heat cycling inside the range cavity can degrade wire insulation, loosen terminals, or cause connectors to corrode or separate. A broken wire, a pulled terminal pin, or a failed connector can all create the open circuit condition that generates F30. Thorough inspection of the full harness length and all connector seating points is essential before replacing the sensor probe.

Source: manufacturer service documentation.

Common causes of F30

  1. 01

    Failed RTD sensor probe

    Part replacement

    The RTD sensor probe itself has developed an internal open circuit. This is confirmed by measuring resistance across the two violet wires at the control module harness connector and comparing the reading to the RTD Sensor Resistance chart. A reading that does not match indicates the sensor must be replaced.

  2. 02

    Broken or damaged wiring harness

    Part replacement

    The wiring harness between the control module and the sensor probe connector can develop broken conductors due to repeated heat cycling inside the range. Visually inspect the full length of the harness for damaged insulation, pinched sections, or severed wires.

  3. 03

    Loose or disconnected harness connector

    Wiring / connection

    A connector that has vibrated loose or was not fully seated at either the sensor probe end or the control module end will create an open circuit. Check that all connectors along the sensor circuit are fully engaged and latched.

  4. 04

    Corroded or damaged connector terminals

    Part replacement

    Terminal pins inside the harness connectors can corrode, back out of their housing, or deform over time, breaking the electrical path. Inspect the two violet wire terminals at the control module connector for corrosion, bent pins, or pulled-back contacts.

See the test procedure for each cause

Frequently asked questions about F30

What does F30 mean on a Bosch range?
F30 on a Bosch range means the control module has detected an open circuit in the oven temperature sensor system. The RTD probe or its wiring is not completing the circuit, so the oven cannot monitor internal temperature. The oven will not operate normally until the fault is resolved.
Can I fix the F30 error myself?
A knowledgeable DIYer can diagnose F30 by measuring resistance at the two violet wires on the control module harness connector and comparing that reading to the RTD Sensor Resistance chart for the model. If the harness is intact and connectors are secure but resistance is wrong, the RTD sensor probe needs replacement. If you are not comfortable working with appliance wiring and connectors, a qualified technician should perform the repair.
Is it safe to use my Bosch range while F30 is displayed?
No, you should not use the oven while F30 is active. The error means the control module cannot read oven temperature, so there is no way for the oven to regulate heat accurately. Attempting to use the oven in this condition creates a risk of overheating.
Will resetting the range clear the F30 error code?
Resetting the range by cycling power may temporarily clear the display, but the F30 code will return as soon as the control module attempts to read the sensor circuit again and finds the open condition. The underlying fault in the sensor probe or wiring harness must be repaired to permanently clear the error.
How much does it cost to repair a Bosch range F30 error?
Repair costs depend on whether the fault is a failed RTD sensor probe or a wiring harness issue. RTD sensor probes typically cost between $30 and $80 for the part. Adding professional labor, total repair costs generally range from $100 to $250. A simple connector reseating requires no parts and minimal labor cost.

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