Could a failing Drain Pump Motor Assembly cause the LG WT7800CW to have symptom: Not Draining Water?

The drain pump motor is the primary mechanical actuator for fluid evacuation. Over time, the internal seals can weep, allowing water to reach the electromagnetic coils and cause a short, or the plastic impeller can shear from the motor shaft. Replacing the motor restores the torque necessary to overcome the head pressure of the standing water.

Could a failing Lid Lock Assembly cause the LG WT7800CW to have symptom: Not Draining Water?

This model utilizes a lid lock as a safety prerequisite for the high-speed centrifugal extraction phase. If the solenoid or strike sensor within the lock assembly fails, the logic board will halt the cycle before the drain phase to prevent potential injury. This results in the tub remaining full of water as the software prevents the pump from energizing.

Could a failing Internal Drain Hose (Corrugated) cause the LG WT7800CW to have symptom: Not Draining Water?

Debris such as coins or clothing fasteners can become lodged in the corrugated bends of the internal hose or at the pump inlet. This creates a fluid restriction that exceeds the pump's lift capacity. While often cleared by hand, structural damage or permanent deformation of the hose requires replacement to ensure laminar flow.

What is the most likely root cause for a LG WT7800CW with symptom: Not Draining Water?

The drain pump motor is the primary mechanical actuator for fluid evacuation. Over time, the internal seals can weep, allowing water to reach the electromagnetic coils and cause a short, or the plastic impeller can shear from the motor shaft. Replacing the motor restores the torque necessary to overcome the head pressure of the standing water.

LG WT7800CW Not Draining Water

CONF	DIAGNOSIS	ACTION
91% CONF	Drain Pump Motor Assembly The drain pump motor is the primary mechanical actuator for fluid evacuation. Over time, the internal seals can weep, allowing water to reach the electromagnetic coils and cause a short, or the plastic impeller can shear from the motor shaft. Replacing the motor restores the torque necessary to overcome the head pressure of the standing water. SKU: 4681EA2001T	VIEW ON AMAZON #CommissionsEarned
5% CONF	Lid Lock Assembly This model utilizes a lid lock as a safety prerequisite for the high-speed centrifugal extraction phase. If the solenoid or strike sensor within the lock assembly fails, the logic board will halt the cycle before the drain phase to prevent potential injury. This results in the tub remaining full of water as the software prevents the pump from energizing.	VIEW ON AMAZON #CommissionsEarned
4% CONF	Internal Drain Hose (Corrugated) Debris such as coins or clothing fasteners can become lodged in the corrugated bends of the internal hose or at the pump inlet. This creates a fluid restriction that exceeds the pump's lift capacity. While often cleared by hand, structural damage or permanent deformation of the hose requires replacement to ensure laminar flow. SKU: AEM73213001	VIEW ON AMAZON #CommissionsEarned

DIY Repair Guide

Watch exactly how to replace the Drain Pump Motor Assembly.

// NOTICE: This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.

PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.

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LG WT7800CW Not Draining Water

DIY Repair Guide