Drainage Failure

Question

Drainage Failure

Accepted Answer

Drain pipe slope insufficient or blocked. Check: Check drain pipe slope — minimum 1/50 (2%) required; horizontal or reverse slope = drainage failure; visually inspect inside hose for scale blockage What to do: Re-route piping to ensure proper slope; flush blocked section with acid cleaner or replace piping Drain pump failure. Check: Check drain pump operation — no motor sound during drain command = failure; manually check impeller rotation What to do: Clean impeller of scale then restart test; replace pump if motor is failed Basin overfill — water supply continues before drainage. Check: Check water level sensor malfunction — if supply solenoid doesn't close, basin overflows; measure water level sensor terminal resistance What to do: Clean or replace water level sensor; verify solenoid valve closes properly Drain hose kink. Check: Visually inspect entire drain hose run — 90-degree kink = immediate drainage blockage cause; especially check routing inside machine room What to do: Re-route hose or add hose support brackets; maintain gentle curve with minimum 100mm radius

Drainage Failure

Likely causes

Drain pipe slope insufficient or blocked

Drain pump failure

Basin overfill — water supply continues before drainage

Drain hose kink

Related cases