Thermador Range Error Code F13

F13 indicates a calibration fault involving either the power board or a related component. On C, CM, and CJ oven models, it typically means the power board is not calibrated, often because the air switch is jammed. On Sago control models, F13 points to the upper oven RTD sensor being out of calibration.

It is not recommended to continue using the oven while F13 is active. The code indicates that the oven cannot confirm accurate temperature calibration, which means cooking temperatures may be unreliable. On Sago control models, an uncalibrated RTD could lead to significant temperature deviation during operation.

Repair costs depend on which component is at fault. If the air switch is simply jammed and can be freed without replacement, costs may be limited to a diagnostic service call, typically in the range of $75 to $150. Replacing the power or relay board can add $150 to $400 or more in parts, while RTD sensor replacement generally falls in the $50 to $150 range for the part, plus labor.

Checking the air switch for physical jamming or obstruction is something a confident DIYer can attempt after disconnecting power to the range. However, testing RTD resistance values, diagnosing relay board faults, and replacing internal components typically require familiarity with appliance wiring and should be handled by a qualified technician if you are not comfortable with those procedures.

A power reset by unplugging the range or switching off the circuit breaker for a few minutes may temporarily clear the F13 code, but it will return if the underlying fault is not corrected. The air switch, RTD, or power board issue must be resolved for the error to be permanently cleared.