Question about DeLonghi DE500 Dehumidifier

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Hi, I have the DE 500P Delonghi Dehumidifier. It is connected to the continuous draining outlet. Recently the pump/motor started making a loud noise and the machine then started to drain water to the water tank instead. I opened all panels, cleaned out all areas that could possibly have been blocked or dirty, observed all tubing to be kink free. I restarted the machine to run by the pump, but again the motor/pump makes a loud sound and reverts to the water tank. It operates normally via the water tank without noise. Can you help me daignose the problem? Do I need to order a new pump/motor to operate the continuous drainage outlet?

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