Samsung Microwave Error Code E4

E4 on a Samsung microwave indicates a problem with the weight sensor, specifically that the sensor is outputting a frequency of 0 Hz when the control board expects a live signal. This sensor is part of the auto-cook system that adjusts cooking based on the load placed on the turntable. The fault typically points to either a failed sensor or a wiring connection problem between the sensor and the control board.

It is generally not recommended to continue using the microwave while E4 is active. The error indicates the weight sensor circuit is not functioning, which means any auto-cook or sensor-cook features that rely on the sensor will not operate correctly. Continuing to use the appliance in a fault state can lead to improper cooking results and may mask additional developing issues.

Unplugging the microwave for a short period may temporarily clear the E4 display, but the code will return as soon as the control board detects the weight sensor is still outputting 0 Hz. A reset does not address the underlying hardware fault. The error will only clear permanently once the defective component or wiring issue has been properly repaired or replaced.

Some causes of E4 can be addressed without replacing parts, such as reseating a loose wire connector or cleaning a corroded terminal. If the wiring checks out, replacing the weight sensor is the next recommended step. Keep in mind that working inside a microwave involves high-voltage components, including the capacitor, which can retain a dangerous charge even when unplugged. If you are not comfortable safely discharging the capacitor and working around high-voltage circuitry, a qualified technician should perform the repair.

If only a wiring connector needs to be reseated or cleaned, the repair may cost little to nothing beyond your time. If the weight sensor needs replacement, parts costs typically range from around $20 to $60 depending on the model, plus labor if a technician performs the work. A full diagnostic service call from a technician generally runs between $75 and $150 before any parts costs are added.