Electrolux Oven Error Code F43

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.

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.

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.

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.

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.