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Error code reference

Thermador Oven Error Code E101

Upper/single cavity (Cvt 1) temperature sensor open.

Thermador codesThermador oven codes

Upper/single cavity (Cvt 1) 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 E101 means on a Thermador oven

Error code E101 on a Thermador oven indicates that the temperature sensor for the upper or single oven cavity (designated as Cavity 1, or Cvt 1) is reading as an open circuit. A temperature sensor in this context is a resistance-based probe, typically an RTD (resistance temperature detector), that changes its electrical resistance in a predictable way as oven temperature rises and falls. When the oven's control board detects no continuity through the sensor circuit, it interprets this as an open condition and triggers E101 to prevent uncontrolled heating.

The sensor circuit runs from the control board through the wiring harness to the probe physically mounted inside the oven cavity. An open circuit can occur at the sensor element itself, at any connector in the harness, or at a damaged section of wire. The first diagnostic step references Diagram 2/4, which maps out the sensor circuit for Cavity 1 and identifies the relevant connector locations, wire routing, and test points that should be inspected before replacing components.

Common contributors to this fault include a physically failed sensor probe, a harness connector that has backed out or corroded, or a wire that has been pinched, burned, or broken near the oven cavity where heat exposure is greatest. The control board itself is a less frequent cause but should be evaluated after the sensor and wiring have been confirmed good. Resistance testing of the sensor at room temperature is the standard first electrical check once the wiring diagram has been consulted.

Source: manufacturer service documentation.

Common causes of E101

  1. 01

    Failed temperature sensor probe

    Part replacement

    The RTD sensor element inside the cavity can fail internally, breaking the circuit. Testing the sensor's resistance at the probe connector will show infinite or no reading when the element has failed.

  2. 02

    Disconnected or corroded harness connector

    Wiring / connection

    Connectors joining the sensor to the main wiring harness can loosen over time or develop corrosion that interrupts continuity. Diagram 2/4 identifies the specific connector locations to inspect and reseat.

  3. 03

    Broken or burned sensor wiring

    Part replacement

    Wire routed near or along the oven cavity is exposed to high heat and can develop breaks, burns, or pinch points that create an open circuit. A visual inspection of the full wire run from the sensor to the control board connection is necessary.

  4. 04

    Damaged sensor probe lead wires

    Part replacement

    The short lead wires directly attached to the sensor probe body can crack or separate at the point where they exit the cavity wall, especially after years of thermal cycling. This damage is often visible upon close inspection.

  5. 05

    Control board input failure

    Part replacement

    If the sensor, all connectors, and wiring test correctly, the sensor input circuit on the control board may have failed. This is the least common cause and should only be considered after all other components in the circuit have been ruled out.

See the test procedure for each cause

Frequently asked questions about E101

What does E101 mean on a Thermador oven?
E101 means the control board has detected an open circuit in the temperature sensor for the upper or single oven cavity (Cvt 1). The sensor is an RTD-type probe that the board uses to monitor cavity temperature, and an open reading means no electrical continuity exists through that circuit. The oven will not operate normally until the fault is resolved. Diagnosis begins with consulting the sensor wiring diagram (Diagram 2/4) and resistance-testing the sensor and harness.
Can I fix an E101 error on my Thermador oven myself?
Some steps, such as reseating loose connectors or visually inspecting wiring for obvious damage, can be performed by a confident DIYer after disconnecting power to the appliance. However, resistance-testing the sensor and harness requires a multimeter and basic knowledge of how to access oven components safely. Replacing the control board is generally best left to a qualified technician. If you are uncertain about working inside the oven's electrical system, professional service is recommended.
Is it safe to use my Thermador oven when E101 is displayed?
No, you should not attempt to use the oven while E101 is active. The error indicates the control system cannot read cavity temperature, which means it cannot regulate heat properly. Operating the oven in this condition risks uncontrolled heating. Discontinue use until the sensor circuit has been inspected and repaired.
Will resetting my Thermador oven clear the E101 error?
A reset, such as cycling the circuit breaker or powering the oven off and back on, may temporarily clear the code from the display. However, if the underlying open circuit condition still exists in the sensor or wiring, E101 will return as soon as the control board runs its diagnostic checks. A reset is not a repair, and the root cause must be addressed to permanently resolve the fault.
How much does it cost to repair a Thermador oven E101 error?
Repair costs depend on which component in the sensor circuit has failed. A replacement temperature sensor probe typically costs in the range of $30 to $80 for the part alone, while a new control board can range from $150 to $400 or more. Adding labor for a professional technician generally brings total repair costs to somewhere between $100 and $500 or higher, depending on the failed component and local service rates.

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