Resetting a microwave oven that runs but fails to heat involves performing a complete electrical power cycle to clear potential microprocessor or relay faults. Because microwaves do not feature a physical reset button, you must unplug the power cord from the wall outlet or turn off the dedicated circuit breaker supplying the appliance. Keep the power completely disconnected for at least two full minutes to allow all internal capacitors and logic boards to discharge entirely. You can troubleshoot power issues safely. You can verify that your corrective action is successful when plugging the unit back in causes the digital display to flash, indicating the control board has rebooted and is ready for safe testing.
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