mypros+
Error code reference

Thermador Range Error Code E3

Oven temperature sensor open circuit (>5000 ohms).

Thermador codesThermador range codes

Oven temperature sensor open circuit (>5000 ohms).

First step from the service manual

Check sensor resistance; should measure 1050 ohms at 75°F.

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

MyPros+ Max

Get the full diagnostic procedure for E3.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E3 means on a Thermador range

The E3 error code on a Thermador range indicates an open circuit condition in the oven temperature sensor, also called an RTD (resistance temperature detector). The control board monitors the sensor's resistance continuously to calculate oven cavity temperature. When the resistance reading climbs above 5000 ohms, the board interprets this as an open or broken circuit and triggers E3. Under normal operating conditions at 75°F, the sensor should measure approximately 1050 ohms, so a reading above 5000 ohms represents a dramatic departure from the expected value.

The oven temperature sensor is a two-wire probe mounted inside the oven cavity, typically positioned at the rear wall. It works on a predictable resistance curve: as temperature rises, resistance increases in a known, linear fashion. When the sensor wire breaks internally, a connector corrodes open, or the probe element itself fails, the circuit is interrupted and resistance spikes far beyond the normal operating range. The control board loses its reference point for temperature regulation and shuts down oven operation to prevent overheating.

The most common physical causes include a failed sensor probe, damaged wiring harness between the sensor and control board, or corroded connectors. Before replacing any components, resistance testing at the sensor terminals and at the connector nearest the control board will isolate whether the fault is in the sensor itself or in the wiring path. A properly functioning sensor will read close to 1050 ohms at room temperature.

Source: manufacturer service documentation.

Common causes of E3

  1. 01

    Failed oven temperature sensor probe

    Part replacement

    The RTD probe element breaks internally, causing resistance to spike above 5000 ohms. Confirm by measuring resistance directly at the sensor terminals; a reading far above 1050 ohms at room temperature confirms sensor failure.

  2. 02

    Broken or damaged sensor wiring harness

    Part replacement

    The wiring between the sensor and the control board can crack or break, especially near stress points where the wire passes through the oven frame. Inspect the full wire run for visible breaks, pinching, or burn marks.

  3. 03

    Corroded or disconnected wire connector

    Wiring / connection

    The connector joining the sensor harness to the control board or to an intermediate junction can oxidize or pull apart, creating an open circuit. Unplug and inspect all connectors in the sensor circuit for corrosion or bent terminals.

  4. 04

    Sensor mounting damage from high heat exposure

    Part replacement

    Prolonged exposure to extreme oven temperatures, especially from a runaway heating event, can permanently damage the sensor probe at its mounting point. Look for discoloration or melting near where the probe enters the oven cavity.

See the test procedure for each cause

Frequently asked questions about E3

What does E3 mean on a Thermador range?
E3 on a Thermador range means the oven temperature sensor is showing an open circuit condition, with resistance exceeding 5000 ohms. The sensor should normally read approximately 1050 ohms at 75°F. This fault prevents the control board from regulating oven temperature accurately, so the oven disables itself. The cause is typically a failed sensor probe, broken wiring, or a corroded connector.
Can I fix a Thermador E3 error myself?
A knowledgeable DIYer can diagnose E3 by testing the sensor resistance with a multimeter at the probe terminals and along the wiring harness. If the sensor reads well above 1050 ohms at room temperature, replacement is straightforward and involves removing the probe from the oven cavity wall and disconnecting the harness. If the sensor tests correctly but the error persists, tracing the wiring harness for breaks or inspecting connectors requires more comfort working inside the appliance.
Is it safe to use my Thermador range while E3 is displayed?
You should not use the oven while E3 is active. Without a functioning temperature sensor, the control board cannot monitor or regulate oven heat, which creates a risk of uncontrolled overheating. The stovetop burners are on a separate circuit and are generally unaffected, but oven operation should be suspended until the sensor fault is resolved.
How much does it cost to repair a Thermador E3 error?
If the oven temperature sensor probe is the cause, replacement parts typically range from $30 to $80 depending on the specific model. If a technician performs the repair, total costs including labor generally fall between $100 and $250. Control board replacement, which is rarely needed for this code, would cost significantly more.
Will resetting the range clear the E3 error code?
Resetting the range by cycling power at the breaker or unplugging it may temporarily clear the E3 code, but the error will return as soon as the control board checks the sensor circuit again. Because E3 indicates a hardware fault with resistance above 5000 ohms, the underlying sensor or wiring problem must be corrected before the code will stay cleared.

Related Thermador range codes

All Thermador range codes
View all 180 Thermador range codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass