Slight noise during operation is usually normal. It is necessary to distinguish between "normal noise" and "abnormal noise":

【Normal Noise (No Handling Needed)】

- Cooling Noise: The compressor produces a slight hum (similar to a refrigerator) during cooling, which disappears after shutdown;

- Water Flow Noise: Water flow impacts the tank when refilling from the bucket, producing a rushing sound that weakens after the water level stabilizes;

- Heating Noise: The heating tube may produce a slight hissing sound during operation, which is a normal thermal expansion and contraction phenomenon.

【Abnormal Noise (Needs Handling)】

1. Resonance Noise:

   - Cause: The dispenser is not placed stably or collides with surrounding items;

   - Solution: Adjust the unit to be level (via bottom leveling feet) and remove surrounding contact items.

2. Friction Noise:

   - Cause: Fan blades are dusty or stuck by foreign objects;

   - Solution: After disconnecting the power, clean the fan blade dust (requires removing the side cover, after-sales operation recommended).

3. Abnormal Sound Warning:

   - Sharp squeaks or metal friction sounds may indicate component wear or looseness;

   - Handling: Immediately turn off the power and stop use, contact after-sales for testing to avoid fault expansion.