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Error code reference

Thermador Range Error Code F16

Catalyst sensor open (Gaggenau EB 270/271/290/291).

Thermador codesThermador range codes

Catalyst sensor open (Gaggenau EB 270/271/290/291).

First step from the service manual

Check sensor wiring. Catalyst sensor resistance is 500 ohms at room temperature.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F16 means on a Thermador range

The F16 error code on Thermador ranges (specifically Gaggenau EB 270, 271, 290, and 291 models) indicates that the catalyst sensor circuit is reading as open. An open circuit means the control board is receiving no signal from the sensor, which is distinct from a shorted or out-of-range reading. The catalyst sensor monitors the catalytic converter element inside the oven cavity, which is responsible for breaking down grease and food vapors during the self-cleaning or catalytic cleaning cycle. Without a functioning sensor signal, the control board cannot verify proper operation of this system and will halt operation to prevent damage.

The primary diagnostic starting point is the sensor's wiring harness and connections. At room temperature, a properly functioning catalyst sensor should measure approximately 500 ohms of resistance. If resistance reads as infinite or open-loop (OL) on a multimeter, the sensor itself has failed internally. If resistance measures correctly at the sensor terminals but the fault persists, the problem lies in the wiring between the sensor and the control board, such as a broken wire, corroded connector, or damaged harness.

Common causes of an open circuit in this sensor include heat-related wire insulation breakdown, physical damage to the wiring harness near the oven cavity, or a failed sensor element. Because this code appears during or after high-temperature cycles, thermal stress is a frequent contributing factor. Technicians should inspect the full length of the wiring harness from the sensor connection to the control board before replacing any components.

Source: manufacturer service documentation.

Common causes of F16

  1. 01

    Broken or disconnected sensor wiring

    Wiring / connection

    A broken wire or unplugged connector in the catalyst sensor harness will create an open circuit. Visually trace the wiring from the sensor to the control board and check for any loose, corroded, or disconnected connectors.

  2. 02

    Failed catalyst sensor

    Part replacement

    The sensor itself may have failed internally, resulting in an open circuit. Measure resistance at the sensor terminals with a multimeter. A reading of anything other than approximately 500 ohms at room temperature indicates the sensor needs replacement.

  3. 03

    Heat-damaged wiring harness

    Part replacement

    High oven temperatures can degrade wire insulation over time, eventually causing a wire to break internally while appearing intact externally. Flex the wiring harness while checking continuity to identify intermittent breaks caused by heat damage.

  4. 04

    Corroded or oxidized connector terminals

    Wiring / connection

    Connector terminals near the oven cavity can oxidize due to heat and moisture exposure, increasing resistance to the point of an open circuit. Inspect all connector pins for discoloration, corrosion, or pitting and clean or replace as needed.

  5. 05

    Faulty control board

    Part replacement

    If the wiring and sensor both check out correctly, the control board's sensor input circuit may have failed. This is the least likely cause and should only be considered after the sensor and all wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about F16

What does F16 mean on a Thermador range?
F16 indicates that the catalyst sensor circuit is reading as open, meaning the control board is receiving no signal from the catalyst sensor. This applies specifically to Gaggenau EB 270, 271, 290, and 291 model ranges. The catalyst sensor monitors the catalytic cleaning element in the oven, and an open circuit prevents the oven from confirming that system is functioning. The fault is most commonly caused by a broken wire, a disconnected connector, or a failed sensor.
Can I fix the F16 error code myself?
A knowledgeable DIYer can perform basic diagnostics by checking the sensor wiring for visible damage and testing sensor resistance with a multimeter. At room temperature, the catalyst sensor should read approximately 500 ohms. If the wiring looks intact and the sensor resistance is correct, further diagnosis and repair typically requires a technician, as the issue may involve internal wiring or the control board.
Is it safe to use my oven while the F16 error is displayed?
It is not recommended to continue using the oven while F16 is active. The control board cannot monitor the catalyst system properly without a functioning sensor, which means it cannot verify safe operation of the catalytic cleaning cycle. Standard baking may also be restricted depending on how the oven responds to the fault.
Will resetting the oven clear the F16 error code?
Resetting the oven by cycling the power may temporarily clear the F16 code, but the fault will return if the underlying problem is not repaired. An open circuit in the catalyst sensor wiring or a failed sensor will continue to trigger the error on startup or during operation. A permanent fix requires identifying and repairing the faulty component.
How much does it cost to repair an F16 error on a Thermador range?
Repair costs vary depending on the root cause. If the fix involves reconnecting a loose wire or cleaning a corroded connector, the cost is primarily the labor charge, which typically ranges from $100 to $200 depending on your location and service provider. If the catalyst sensor itself needs replacement, parts and labor combined can range from $150 to $400 or more. A control board replacement would be at the higher end of repair costs.

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