Thermador Oven Error Code F61

F61 indicates that the lower oven temperature sensor circuit has opened, meaning the relay board is not receiving any valid resistance signal from the lower oven sensor. The oven shuts down to prevent uncontrolled heating without proper temperature monitoring. The fault points to either a wiring connection issue at pin header P2 on the relay board or a failed sensor.

No, you should not attempt to operate the oven while F61 is active. The code indicates the control board cannot monitor the lower oven temperature, which means the oven cannot regulate heat properly. Continued use without a functioning temperature sensor creates a risk of overheating.

If the issue is only a loose or corroded connector at the relay board, repair costs may be minimal if you are comfortable doing the inspection yourself. Replacing the lower oven temperature sensor typically costs between $50 and $150 for the part, with professional labor adding $100 to $250 depending on your area. If the wiring harness needs replacement the total cost can be higher, generally in the $200 to $400 range for parts and labor combined.

Start by disconnecting power to the oven and inspecting the wiring connector at pin header P2 on the relay board for loose pins, corrosion, or backed-out terminals. If the connector looks intact, use a multimeter to test the lower oven sensor leads for continuity. If the sensor reads open, it will need to be replaced. If the sensor tests good, inspect the wiring harness along its full run for breaks or heat damage.

A power reset by turning off the circuit breaker for 60 seconds may temporarily clear the display, but the code will return as soon as the oven attempts to operate if the underlying wiring or sensor fault has not been repaired. The F61 fault requires a physical repair to the sensor circuit, not just a reset.