Whirlpool Microwave Error Code ERR 1

ERR 1 indicates the control board has detected a short circuit in the microwave relay circuit. The relay is the component that switches power to the magnetron, which generates the cooking energy. The microwave shuts down when this error appears to prevent further electrical damage or a potential fire hazard. The fault must be diagnosed and repaired before the unit can safely operate.

No, the microwave should not be used while ERR 1 is active. A short circuit in the relay circuit poses a risk of further component damage, overheating, or in severe cases, a fire. Keep the unit unplugged until the fault has been properly diagnosed and repaired.

Repair costs vary depending on which component has failed. Relay replacement is generally a lower-cost repair, while magnetron replacement is more expensive and can range into the $150 to $350 range including labor, depending on the model and service rates in your area. If the control board is the faulty component, costs can be higher. Getting a diagnostic estimate first will help you decide whether repair or replacement is the better value.

Repairing this error requires working near high-voltage components, including a capacitor that can hold a lethal charge even after the microwave is unplugged. DIY repair is not recommended unless you have specific experience discharging microwave capacitors and working with high-voltage circuits. A qualified appliance technician should perform the diagnosis and any relay, magnetron, or wiring repairs.

A power reset by unplugging the unit may temporarily clear the error display, but it will not resolve the underlying short circuit condition. The fault is caused by a hardware problem such as a welded relay, shorted magnetron, or damaged wiring, and it will return as soon as the microwave attempts to operate again. A reset alone is not a fix.