Dishwasher Not Draining

Blocked Dishwasher Filter

The most common cause. The filter sits at the bottom of the dishwasher tub and collects food debris during each cycle. If it becomes clogged, water cannot drain away properly. Clean the filter at least once a month.

Kinked or Blocked Drain Hose

If the drain hose is kinked, crushed or blocked, water cannot exit the machine. The hose should run without sharp bends from the appliance to the household drain or waste pipe.

Blocked Household Drain or Waste Pipe

A blockage in the sink waste pipe or the connection point where the dishwasher drain hose connects can prevent water from draining away even if the machine itself is working correctly.

Blocked Drain Pump

If food debris or a foreign object has reached the drain pump it can block the impeller and prevent the pump from operating. The pump is located beneath the filter housing.

Faulty Drain Pump

If the drain pump motor has failed it will not be able to remove water from the machine regardless of whether the filter and hose are clear. Requires professional diagnosis and replacement.

Clean the Dishwasher Filter

Remove the filter assembly from the bottom of the dishwasher tub — it usually twists out anticlockwise. Rinse thoroughly under running water, using a soft brush to clear stubborn debris. Refit securely before the next cycle.

Check the Drain Hose

Inspect the drain hose at the back of the machine for any kinks or blockages. Ensure it is not pushed too far into the standpipe, which can cause siphoning and prevent proper drainage.

Check the Sink Waste Connection

Run the kitchen sink to check the household drain is flowing freely. If the sink is also draining slowly, the blockage is in the household plumbing rather than the dishwasher.

Check the Pump Area

With the machine empty, check the area around the filter and pump housing for any debris or foreign objects that may be obstructing the pump impeller.

Reset the Machine

Switch the dishwasher off at the mains and leave it unplugged for a few minutes. Plug back in and run a short cycle to see if drainage has been restored.