Samsung Microwave Error Code E-42

The E-42 code indicates an Easy Sensor or PH Sensor short circuit error. The microwave's control board has detected that the humidity sensor circuit is shorted, meaning the electrical signal from the sensor is outside the normal operating range. The microwave will stop functioning normally until the fault is diagnosed and corrected.

No, you should not attempt to use the microwave while E-42 is active. The error indicates the sensor circuit is shorted, and the microwave's automatic sensor cooking functions will not operate correctly. Continuing to use the appliance in this condition could lead to overcooked food, unattended operation issues, or additional component damage.

Repair costs depend on the root cause. Replacing a humidity sensor typically costs between $30 and $80 for the part, with professional labor adding $75 to $150 depending on your area. If the control board requires replacement, total costs can range from $150 to $300 or more. In some cases, cleaning a corroded connector resolves the issue at no parts cost.

Some steps, such as inspecting the wiring harness for visible damage or cleaning corroded connectors, can be done by a knowledgeable DIYer. However, testing sensor resistance with a multimeter and replacing the sensor requires comfort with disassembly and basic electrical testing. Keep in mind that microwaves contain a high-voltage capacitor that can hold a dangerous charge even when unplugged, so internal access should only be attempted by those familiar with proper discharge procedures.

Unplugging the microwave for a few minutes and restoring power may temporarily clear the error display, but the code will return if the underlying sensor fault is still present. A reset does not repair a shorted sensor or damaged wiring. A lasting fix requires identifying and correcting the root cause.