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Error code reference

Electrolux Oven Error Code ECEu

Top cavity thermocouple failure (TCAV UP)

Electrolux codesElectrolux oven codes

Top cavity thermocouple failure (TCAV UP) - stops cycle unless steam 100°C. Connector, TC sensor, or ACU failure.

First step from the service manual

Check thermocouple signal; Check X18 on ACU; replace thermocouple.

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

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What ECEu means on a Electrolux oven

The ECEu error code on an Electrolux oven indicates a failure in the top cavity thermocouple (labeled TCAV UP in the control system). The thermocouple is a temperature-sensing device that generates a small millivolt signal proportional to heat. The oven's Appliance Control Unit (ACU) continuously monitors this signal to regulate cooking temperature in the upper cavity. When the ACU detects that the thermocouple signal is absent, out of range, or inconsistent, it triggers the ECEu fault and halts the active cooking cycle. The one exception is steam cycles operating at 100 degrees Celsius, which may continue under specific conditions.

The fault points to three primary failure areas: the wiring and connector at the ACU (specifically connector X18), the thermocouple sensor itself, or an internal failure within the ACU. Connector X18 is the designated interface between the top cavity thermocouple circuit and the control board. Corrosion, a loose pin, or a damaged connector at X18 can interrupt the signal without the sensor itself being defective. The thermocouple sensor can also fail due to physical damage, heat stress over time, or an open circuit in the sensor element, producing no usable signal for the ACU to interpret.

Diagnosis begins by checking the thermocouple signal output at the connector. A functioning thermocouple produces a voltage that rises with temperature. If the signal is absent or flat, inspect connector X18 on the ACU for corrosion, bent pins, or loose seating before condemning the sensor. If the connector is intact and the sensor reads incorrectly, replace the thermocouple. If a new thermocouple and confirmed good wiring do not resolve the code, ACU replacement should be considered.

Source: manufacturer service documentation.

Common causes of ECEu

  1. 01

    Loose or corroded connector at X18 on the ACU

    Wiring / connection

    The X18 connector on the Appliance Control Unit links the top cavity thermocouple circuit to the board. A loose pin, corroded terminal, or improperly seated connector can break the signal path and trigger ECEu without the sensor itself being faulty.

  2. 02

    Failed top cavity thermocouple (TCAV UP)

    Part replacement

    The thermocouple sensor can develop an open circuit or degrade from repeated heat cycling, causing it to produce no signal or an out-of-range reading. Checking the sensor's output voltage at operating temperature will confirm whether it is functioning correctly.

  3. 03

    Damaged thermocouple wiring

    Part replacement

    The wiring harness between the thermocouple and the ACU can be pinched, burned, or broken, especially near high-heat areas of the oven cavity. A visual inspection and continuity check of the harness will identify any open or short circuit.

  4. 04

    ACU (Appliance Control Unit) failure

    Part replacement

    If the thermocouple, connector, and wiring all test correctly, an internal failure within the ACU may be preventing it from reading the sensor signal. ACU failure is the least common cause and should only be considered after the other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about ECEu

What does ECEu mean on a Electrolux oven?
ECEu indicates a failure in the top cavity thermocouple, identified internally as TCAV UP. This sensor monitors the temperature in the upper oven cavity and sends a signal to the Appliance Control Unit. When that signal is lost or falls outside acceptable parameters, the oven stops the active cycle and displays ECEu. The fault can originate from the thermocouple itself, the wiring connector at ACU port X18, or the control board.
Can I fix the ECEu error myself, or do I need a technician?
A knowledgeable DIYer can start by inspecting connector X18 on the ACU for visible corrosion or loose pins, since a poor connection is often the cause. If the connector looks good, replacing the top cavity thermocouple is a straightforward repair for someone comfortable working on appliances. However, if the error persists after those steps, diagnosing or replacing the ACU typically requires a qualified technician.
Is it safe to use my Electrolux oven when ECEu is displayed?
The oven stops the cooking cycle when ECEu appears precisely because it cannot reliably monitor upper cavity temperature. Operating the oven without accurate temperature sensing creates a risk of overheating, so continued use until the fault is resolved is not recommended. The only exception noted is steam cycles running at 100 degrees Celsius, which may continue under specific conditions.
Will resetting the oven clear the ECEu error code?
Powering the oven off and back on may temporarily clear the display, but the ECEu code will return if the underlying fault still exists. The thermocouple signal is monitored continuously during operation, so any persistent wiring, sensor, or ACU issue will trigger the error again. A reset alone is not a fix and should not be relied upon as a solution.
How much does it cost to repair an ECEu error on an Electrolux oven?
Repair cost depends on which component is at fault. A thermocouple sensor replacement is generally the least expensive part of the repair, typically in the range of $20 to $80 for the part, plus labor if a technician is involved. If the ACU is the cause, control board replacements can range from $150 to $400 or more for parts alone. Diagnostic labor fees from a service technician commonly add $75 to $150 on top of parts costs.

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