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Error code reference

Electrolux Oven Error Code F43

The microwave external cooling fan speed (as read by the tachometer input of the Appliance Control Board) is…

Electrolux codesElectrolux oven codes

The microwave external cooling fan speed (as read by the tachometer input of the Appliance Control Board) is abnormally slow.

First step from the service manual

Check if the microwave external cooling fan is turning; this fan should be active anytime the microwave is used.

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

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What F43 means on a Electrolux oven

The F43 error code on an Electrolux oven indicates that the Appliance Control Board has detected an abnormally low speed from the microwave external cooling fan, as reported through the board's tachometer input. The tachometer circuit monitors the fan's rotational speed by reading pulse signals generated during operation. When the fan spins too slowly or stops entirely, the pulse frequency falls below an acceptable threshold, and the control board registers the fault. This fan is designed to run continuously whenever the microwave function is in use, so any deviation from expected speed during operation will trigger this code.

The external cooling fan serves a critical thermal protection role, drawing heat away from the microwave's magnetron and associated electronics. If this fan underperforms, internal temperatures can rise to levels that damage sensitive components. Common sources of this fault include a worn or failing fan motor, a mechanical obstruction in the fan assembly such as debris or a seized bearing, a wiring fault between the fan motor and the control board, or a failed tachometer sensor within the fan unit itself.

Diagnostic work should begin by confirming whether the fan is physically spinning when the microwave is activated. If the fan is not turning at all, the motor, its power supply wiring, or the control board output circuit are the primary suspects. If the fan is spinning but slowly, a worn motor bearing or partial winding failure is more likely. Resistance and voltage checks at the fan motor connector will help isolate whether the fault is in the motor itself or the upstream wiring and control board.

Source: manufacturer service documentation.

Common causes of F43

  1. 01

    Failed or worn fan motor

    Part replacement

    The fan motor may have a worn bearing or a partially failed winding, causing it to spin too slowly or stop entirely. A motor that hums but does not spin freely when turned by hand points to a seized bearing.

  2. 02

    Obstruction in the fan assembly

    Wiring / connection

    Debris, grease buildup, or a displaced wire can physically block the fan blades from reaching normal speed. Inspect the fan blade and housing for any foreign material or contact points that restrict rotation.

  3. 03

    Wiring fault between the fan and control board

    Wiring / connection

    A broken, corroded, or loose connector in the harness running from the fan motor to the Appliance Control Board can interrupt both the power supply to the motor and the tachometer signal. Inspect the connector pins and wiring for damage or corrosion.

  4. 04

    Faulty tachometer sensor

    Part replacement

    The tachometer sensor within the fan unit generates the speed signal read by the control board. If the sensor has failed, the board may report a slow or absent signal even if the fan motor itself is functioning correctly.

  5. 05

    Defective Appliance Control Board

    Part replacement

    If the fan motor, wiring, and tachometer sensor all check out correctly, the control board's tachometer input circuit may have failed, causing it to misread or not read the speed signal at all.

See the test procedure for each cause

Frequently asked questions about F43

What does F43 mean on a Electrolux oven?
F43 indicates that the Appliance Control Board has detected an abnormally slow speed from the microwave external cooling fan via its tachometer input. This fan is required to run any time the microwave is in use. The fault may be caused by a failing motor, a physical obstruction, a wiring issue, or a faulty tachometer sensor. The oven triggers this code to prevent heat damage to the microwave's internal components.
Can I fix F43 on my Electrolux oven myself?
Some causes of F43 are accessible to a knowledgeable DIYer, such as clearing a physical obstruction from the fan blades or inspecting connectors for obvious damage. However, replacing the fan motor, tachometer sensor, or control board involves working inside the appliance cavity and requires disconnecting power and handling high-voltage components. If you are not comfortable with appliance electrical repair, a qualified technician is the safer choice.
Is it safe to keep using my Electrolux oven when F43 is displayed?
You should avoid using the microwave function while F43 is active. The cooling fan protects the magnetron and electronics from overheating, and running the microwave without adequate airflow can cause permanent damage to those components. The conventional oven functions may still be usable, but the microwave should remain off until the fault is resolved.
Will resetting my Electrolux oven clear the F43 error code?
A power reset by unplugging the oven or switching off the circuit breaker may temporarily clear the F43 code, but it will return as soon as the microwave is used again if the underlying problem has not been fixed. Resetting does not repair a failed motor, wiring fault, or defective sensor. The code should be treated as a persistent diagnostic signal rather than a one-time glitch.
How much does it cost to repair an F43 error on an Electrolux oven?
Repair costs vary depending on the faulty component and whether you hire a technician. A replacement cooling fan motor or fan assembly typically ranges from around $30 to $100 for the part alone. If the Appliance Control Board needs replacement, parts costs can range from $150 to $350 or more. Adding professional labor, total repair costs generally fall between $100 and $500 depending on the diagnosis.

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