What if the drain hose is clear, but the E2 error code persists? What's the next step?

If the drain hose is clear, the issue likely lies with the drain pump. Unplug the machine and access the drain pump (usually located at the bottom front or back of the machine – consult your user manual). Check for obstructions *inside* the pump itself. You may need to remove a cover to access the impeller and clear any debris. If the pump seems damaged, it may need replacing.