Bosch Range Error Code F33

F33 on a Bosch range indicates that the warming drawer temperature sensor has an open circuit fault while the warming drawer is active. The control board is not receiving any valid signal from the sensor, which prevents the warming drawer from operating properly. Bosch includes a 20-second delay before triggering F33 to filter out false alarms caused by electrical noise on the longer sensor wire runs common in warming drawer installations.

The rest of the range's cooking functions are typically unaffected by F33 since the fault is isolated to the warming drawer circuit. However, you should not rely on the warming drawer while F33 is active, as the control board cannot monitor its temperature safely. Leaving the warming drawer feature active with a failed sensor creates a risk of uncontrolled heating in that zone.

Repair costs depend on which component has failed. A warming drawer temperature sensor replacement typically falls in the range of $30 to $80 for the part alone, with additional labor costs if a technician performs the repair. Wiring harness repairs can vary widely depending on the extent of the damage. A control board replacement is the most expensive scenario, with parts generally ranging from $150 to $400 or more depending on the model.

Some causes of F33 are accessible to experienced DIYers. Checking and reseating the sensor connectors along the warming drawer harness requires only basic tools and no replacement parts. If the sensor itself has failed, replacing it is a moderately involved repair that requires identifying the correct replacement sensor and disconnecting power before working on the appliance. Control board replacement is generally best left to a qualified technician.

Resetting the range by cutting power at the breaker may temporarily clear F33, but the code will return as soon as the warming drawer is used again if the underlying sensor or wiring fault has not been repaired. Because the fault delay is 20 seconds, F33 will reappear quickly once the open circuit condition is detected again. A reset is useful for confirming the fault is active and repeatable, but it does not substitute for diagnosing and correcting the root cause.