Bosch Range Error Code F3

F3 on a Bosch range indicates that the warming drawer temperature sensor is reading a resistance value outside the expected range. The control board monitors the thermistor in the warming drawer circuit and triggers this fault when it receives a signal it cannot interpret as a valid temperature. The issue typically points to a failed sensor, damaged wiring, or a poor connection in the sensor circuit.

The F3 fault is specific to the warming drawer sensor circuit and does not directly affect the main oven or cooktop burners. However, the warming drawer should not be relied upon while this fault is active, as the control board may disable the drawer or be unable to regulate its temperature accurately. Continued use of a malfunctioning heating circuit is not recommended until the fault is diagnosed and repaired.

A power reset, done by unplugging the range or switching off the circuit breaker for several minutes, may temporarily clear the F3 code if the fault was caused by a transient signal issue. However, if the underlying problem is a failed thermistor, damaged wiring, or a bad connection, the code will return once the range is powered back on and the control board runs its sensor check. A reset alone does not fix the root cause.

Some causes of F3 are DIY-accessible, such as reseating a loose connector or inspecting wiring for visible damage. Testing the thermistor with a multimeter is also a straightforward step for someone comfortable with basic electrical diagnostics. However, replacing the thermistor or control board involves working near electrical components and disassembling part of the range, which may be better suited to a qualified technician.

Repair costs vary depending on which component has failed. A replacement warming drawer thermistor sensor is generally an affordable part, with DIY repair costs primarily covering the part itself in the range of roughly $20 to $60. If a technician is needed for diagnosis and installation, total service costs including labor typically range from $100 to $300 or more. A control board replacement, if required, can significantly increase the overall cost.