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Fault Codes

Thermador Range/Stove/Oven Fault Codes starting with an F

Error
Code
Notes
Check/Repair
F0 Internal logic failure; cancel key supervision. Sounds alarm and resets to non-cook mode Replace the electronic range control (also called clock or ERC)
F1 Internal logic failure (monitoring function). Sounds alarm and inhibits cook modes Replace the electronic range control (also called clock or ERC)
F2 Temperature runaway detected (Bake/Broil: 600 - 700 F; Clean: 930 - 1000 degrees F). Sounds alarm and resets to non-cook mode. Check relay board for stuck contacts. Check oven temperature sensor for normal room temperature resistance (1085-1097 ohms at 75 degrees F). Check sensor wiring connectors for a loose or high resistance connection. Check electronic range control (also called clock or ERC) functions Replace relay board if necessary. Replace oven temperature sensor if other components check normal. If failure repeats, replace electronic range control (also called clock or ERC)
F3 Open circuit detected; oven temperature sensor. Check sensor for normal room temperature resistance (1085-1097 ohms at 75 degrees F). Check wires and connections between electronic range control (also called clock or ERC) and oven temperature sensor Replace sensor if other components check normal. Replace electronic range control (also called clock or ERC) if fail code reoccurs
F4 Short circuit detected; oven temperature sensor. Check sensor for normal room temperature resistance (1085-1097 ohms at 75 degrees F). Check wires between electronic range control (also called clock or ERC) and sensor. Replace sensor if other components check normal. Replace electronic range control (also called clock or ERC) if fail code reoccurs
F7 Function key shorted for over 16 seconds. Check for something pressing a key or preventing normal release of the key Replace electronic range control (also called clock or ERC) if other components check normal
F8 Internal logic failure; calibration. Alarm sounds and resets to non-cook mode. Check oven temperature sensor for normal room temperature resistance (1085-1097 ohms at 75 F). Check wires and connections between electronic range control (also called clock or ERC) and oven temperature sensor Replace electronic range control (also called clock or ERC) and oven temperature sensor if other components check normal
F9 Internal logic failure; door latch supervision. Alarm sounds and resets to non-cook mode. If door is locked due to clean temperatures, disconnect power until door can be unlocked Replace the electronic range control (also called clock or ERC)
Fd Bake & Broil relay drives active simultaneously. Check relay board for damage: trace E6 to K2 & K3, and burned contacts K3 & K4 Replace electronic range control (also called clock or ERC). Replace relay board if necessary
Blank display No power to electronic range control (also called clock or ERC). Check oven light and cooktop dial lights (powered by L2 & L1, respectively). Check relay board transformer primary, E1 to E2 (140 ohms typical). If the transformer internal fuse is still OK, check output voltages, pins 9 - 8 (3.2 v.a.c.) and 7 - 6 (21 v.a.c.). Check clock functions after replacing relay board If relay board transformer open (E1 to E2), replace relay board. If still no clock functions replace electronic range control (also called clock or ERC)