If your dishwasher is not draining, there is likely a blockage in the drain hose, or the pump may be defective. However, you don’t need to call a technician or plumber straight away, as you may be able to fix the issue yourself. This guide gives you all the likely causes and solutions, starting from the most common and easiest to fix.
Most dishwashers have a filter located in the dishwasher tub underneath the spray arm. If you are not in the habit of emptying the filter, debris may be clogging it and restricting the dishwasher’s ability to drain.
If your dishwasher connects to the garbage disposal, it may be blocked, which can affect the dishwasher’s ability to drain. Alternatively, if the dishwasher has recently been connected to the garbage disposal, the drain plug may not have been removed. If you are not keen on disconnecting the drain hose, you can try pouring a non-toxic drain cleaner into the disposal.
If the dishwasher is not draining, a clogged drain hose is often responsible. If you are lucky, you will be able to clear the blockage with vinegar and baking soda. Otherwise, the drain hose will need to be disconnected, which can involve disassembling the dishwasher. If you need to disassemble the dishwasher, you will want to check the drain pump, and possibly the check valve (depends on the dishwasher) while you have access to it.
If the issue remains, the drain hose needs to be disconnected and removed from the dishwasher. Once the drain hose has been disconnected and removed, it can be unclogged with a drain snake tool, or flushed out with water.
Removing the drain hose usually involves dismantling the dishwasher. However, disconnecting the drain hose where it connects underneath the sink may reveal the blockage, saving you from having to dismantle the dishwasher. See dishwasher dismantling instructions below (under checking the pump).
Occasionally, the dishwasher’s drain pump can become clogged, or the pump can fail either mechanically or electronically. If the drain hose isn’t clogged, a problem with the pump is the next most likely cause of the drainage issue. A multimeter is needed to test the pump for an electrical issue.
You should be able to determine if the pump has failed by listening for the pump to activate when the dishwasher enters the drainage cycle. If you cannot hear the pump or the pump sounds like it is struggling and not operating normally, the pump most likely needs to be replaced.
Accessing the pump depends on the type of dishwasher. You may be able to access the pump by removing the covers in the tub and sump, but most likely, the dishwasher’s kick plate needs to be removed, and the dishwasher needs to be put on its back to access the pump underneath the sump.
Depending on the dishwasher, you may now be able to access and remove the pump. If you cannot access and remove the pump, the dishwasher needs to be moved.
If the pump is damaged or fails the multimeter continuity test, it needs to be replaced to fix the drainage issue.
If the above causes and solutions have failed to fix the problem, one of the following components may be defective. Not all dishwashers have these components, and the locations can vary. Check the dishwasher’s manual to see if the component applies to your dishwasher and its location. If the component is defective, it will most likely need to be replaced.
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