Tip & How-To about Dishwashers

My dishwasher will not drain the water.

This can be one of the most common faults with dishwashers i find that i get called out for. Generally there is nothing actually wrong with the mechanics of the unit.
Most dishwashers have a certain time to drain the water away and any restrictions in the waste hose or the drain pump not turning causes the unit to fault.

1. Firstly Check and clean the filter in the base of the unit as this may be blocked.

2. Then check for any kinked hoses from the sink end to behind the unit. Sometimes extension hoses are attached to the existing hose which are not the correct type of hose and this can then sag and then cause a restriction in the hose.

3. Remove the drain hose from the U bend under the sink. Check the drain spigot where the drain hose connects into the u bend. Usually this is where food gets trapped due to the spigot hole not being drilled out large enough. This then causes a blockage. Or a foreign particle too large to go through the hole gets trapped here. If you find it blocked clear the blockage and open up the hole so there is no shoulder for blockages to start forming again.

4. Also check the non return valve under the filter and make sure the drain pump can turn freely if your model has access to this. You may just have something trapped in the drain pump. Glass or plates are a common thing to break in a dishwasher and get trapped here in the drain pump. The pump then cannot freely turn and drain the water away. Glass is also hard to see with water in the sump so use a torch.

5.Lastly see if you can hear the drain pump switching on when the unit first starts up. This is before the unit fills with water, If it doesn't then the pump may be defective.

Hope this helps.

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1 Answer

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Regards Sam

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