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Error code reference

Thermador Oven Error Code E201

Lower cavity (Cvt 2) temperature sensor open.

Thermador codesThermador oven codes

Lower cavity (Cvt 2) temperature sensor open.

First step from the service manual

Refer to Diagram 2/4.

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

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What E201 means on a Thermador oven

Error code E201 on a Thermador oven indicates that the temperature sensor for the lower cavity (referred to as Cavity 2, or Cvt 2) has an open circuit condition. A temperature sensor in an oven circuit is a resistive probe, typically an NTC (negative temperature coefficient) or RTD (resistance temperature detector) type, that changes its resistance value in proportion to the cavity temperature. An open circuit means the control board is reading infinite or no resistance from the sensor loop, which prevents the oven from accurately monitoring lower cavity temperature and triggers a fault shutdown.

The open condition can originate at the sensor element itself, in the wiring harness between the sensor and the control board, or at the connector terminals. Physical damage to the sensor probe from high heat exposure, a broken wire in the harness, or a corroded or burned connector pin can all produce an open circuit reading. Because Diagram 2/4 is the reference for this fault, the wiring schematic for the lower cavity sensor circuit should be consulted to trace the full signal path before condemning any single component.

Diagnosing this fault requires a multimeter to measure continuity and resistance across the sensor terminals and along the harness. A properly functioning sensor should show a measurable resistance value at room temperature rather than an open line. Technicians should check the sensor connector at the board, inspect the harness for pinched or broken wires, and test the sensor element directly before determining whether a replacement sensor or harness repair is needed.

Source: manufacturer service documentation.

Common causes of E201

  1. 01

    Failed lower cavity temperature sensor

    Part replacement

    The sensor probe itself may have developed an internal open circuit, often caused by prolonged high heat exposure or physical damage. Testing the sensor directly with a multimeter for resistance will confirm whether the element has failed.

  2. 02

    Broken or damaged wiring harness

    Wiring / connection

    A wire in the harness connecting the lower cavity sensor to the control board may be broken, pinched, or chafed, creating an open circuit. Visually inspect the harness routing and test each wire segment for continuity using Diagram 2/4 as a guide.

  3. 03

    Loose or corroded sensor connector

    Wiring / connection

    The connector at either the sensor end or the control board end may have pulled loose, corroded, or burned, interrupting the circuit. Unplugging and firmly reseating the connector, and inspecting the pins for corrosion or heat damage, can resolve or identify this issue.

  4. 04

    Burned or damaged connector terminal

    Part replacement

    High resistance or arcing at a connector terminal can cause the terminal to burn, which can eventually result in an open circuit reading. Inspect terminals closely for discoloration, melting, or carbon deposits, and replace the connector or harness section if damage is found.

  5. 05

    Faulty control board

    Part replacement

    If the sensor and entire harness test correctly with no open circuit, the control board's sensor input circuit may have failed, causing it to incorrectly report an open condition. This is the least likely cause and should only be considered after the sensor and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about E201

What does E201 mean on a Thermador oven?
E201 means the control board has detected an open circuit in the lower cavity temperature sensor (Cvt 2). The sensor is responsible for monitoring the temperature inside the lower oven cavity. Without a valid signal from this sensor, the oven cannot regulate heat safely and will display the fault code. The issue can be in the sensor itself, the wiring, or the connectors.
Can I fix a Thermador E201 error myself?
A knowledgeable DIYer can start by checking the sensor connector for looseness or visible damage, which requires no special tools. Testing the sensor and harness with a multimeter is the next step and requires following the wiring diagram labeled Diagram 2/4. Replacing a sensor is a manageable repair for those comfortable working with appliance wiring, but any work involving the control board or internal harness is generally best left to a qualified technician.
Is it safe to use my Thermador oven with an E201 error code?
It is not recommended to use the lower cavity of the oven while E201 is active. Because the control board cannot read the lower cavity temperature, it cannot regulate heating safely, which creates a risk of overheating. The upper cavity may still function depending on your oven model, but the lower cavity should be considered inoperable until the fault is resolved.
Will resetting the oven clear the E201 error code?
A reset, such as cycling the circuit breaker or powering the oven off for several minutes, may temporarily clear the display. However, if the underlying fault with the lower cavity sensor or its wiring is not corrected, the E201 code will return when the oven powers back on and runs its diagnostic checks. A reset alone is not a repair and does not address the root cause.
How much does it cost to repair a Thermador E201 error?
Repair costs vary depending on the root cause. A replacement lower cavity temperature sensor typically costs in the range of $30 to $80 for the part, while professional labor for diagnosis and installation can add $100 to $250 or more depending on your location and service provider. If the control board is the cause, replacement costs are significantly higher and can range from $200 to $500 or more for the part alone.

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