When a residential clothes dryer starts tumbling or running its motor automatically as soon as you plug it into the wall outlet, even without pressing the start button or turning the dial, the malfunction points directly to a stuck or welded motor relay switch on the electronic control board or a shorted push-to-start switch. When internal electrical contacts melt together from a power surge, continuous electrical current flows straight to the drive motor. You can troubleshoot relay faults safely. You can verify that your corrective action is successful when replacing a defective electronic control board or swapping a stuck start switch stops the motor from running until you intentionally press the start button.
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