Thermador Oven Error Code Fr

Fr indicates a fault condition in the lower oven that can involve three separate issues: an invalid door lock switch status due to a jammed or defective latch, a communication error between the relay board and display head, or a disabled element supervisor caused by a faulty lower oven temperature sensor or relay board. The control displays Fr to alert the user that the lower oven cannot operate safely or reliably until the underlying fault is corrected.

Fr indicates the lower oven's element supervisor or door lock system has been compromised, meaning the oven may not be able to accurately monitor temperature or confirm a safe door position. It is not advisable to operate the lower oven for cooking or self-clean cycles while this code is active. The upper oven, if present, may still be functional, but the lower oven should be left off until the fault is resolved.

Repair costs vary depending on which component is at fault. A lower oven temperature sensor is generally the least expensive part to replace, with parts and labor typically ranging from around 150 to 300 dollars. If the lower oven relay board or display head requires replacement, costs can range from approximately 300 to 600 dollars or more depending on parts availability and labor rates in your area. Getting a diagnostic call from a qualified technician first will help clarify which component is actually at fault before committing to a repair.

A power reset may temporarily clear the Fr code if the fault was caused by a momentary communication glitch or a brief sensor dropout, but the code will typically return if a physical component has actually failed. If the code comes back after cycling power, proceed with inspecting the lower oven latch switches, wiring connections, and temperature sensor. A persistent Fr code requires hands-on diagnosis and likely a component replacement.

Start by confirming the lower oven door latch is not physically jammed and that all latch switches operate correctly when the latch is cycled. Next, inspect all wiring harnesses and communication connections between the relay board, display head, and temperature sensor for looseness or damage. If connections are good, replace the lower oven temperature sensor. If the Fr code persists after sensor replacement, the lower oven relay board is the next component to replace.