Viking Oven Error Code F09

F09 indicates a runaway oven temperature condition. The electronic oven control has detected that the oven temperature has risen well beyond the set point and has exceeded the maximum limit of 650°F. The oven shuts down to prevent a fire hazard or damage to the appliance. The fault is typically caused by a failed RTD temperature sensor or a faulty EOC control board.

Powering down the oven and restoring power may temporarily clear the fault code, but it will not fix the underlying problem. If the RTD sensor or EOC board has failed, the runaway temperature condition will recur once the oven is used again. A proper repair requires diagnosing the RTD resistance and, if necessary, replacing the EOC.

Repair costs vary depending on which component has failed. An RTD sensor replacement is typically the less expensive repair, with parts generally ranging from around $50 to $150 depending on the specific model. An EOC board replacement is more costly, with parts commonly ranging from $200 to $500 or more, plus labor if a technician is performing the work.

No, you should not use the oven while F09 is active. The error means the oven's temperature regulation has failed and the cavity temperature has already exceeded 650°F. Continuing to operate the oven in this condition poses a fire risk and can permanently damage the appliance. Keep the oven off until the underlying cause has been diagnosed and repaired.

Start by powering down the oven completely, then test the RTD probe with a multimeter to verify it is reading within the correct resistance range for the oven's ambient temperature. If the RTD tests good, the next step is to replace the electronic oven control board. If the RTD is out of range or has a short, replace the sensor first before evaluating the EOC.