Water pump is very loud or makes a buzzing noise but little or no water flows.

Safety first: Unplug the unit and empty the reservoir before handling the pump.

• Bleed air: Refill the reservoir fully and tilt the unit slightly forward and backward (while unplugged) to help release trapped air from the pump.
• Clean filter: Remove and clean the pump inlet filter and any debris from the reservoir bottom.
• Inspect hoses: Check for kinks or blockages in the hoses connected to the pump. Straighten or replace as needed.
• Replace pump: If the pump remains noisy and flow is weak, replace the water circulation pump with a Clatronic‑compatible unit.