My 18 month old dishwater won’t drain
Hi, please Inspect the dishwasher's drain connection at the sink.
When your dishwasher isn't draining, it could actually be your sink's drain that's causing the issue. If you're using a garbage disposal, make sure it is clear of food waste and not clogged.
If your dishwasher is connected directly to the drain, look down the drain and check if there is any visible blockage.
If the dishwasher or garbage disposal was recently installed, the disposal cap may be the cause of the blockage as well, so make sure it's removed.
Also, Check the drain hose.
The most common reason for a drain issue right after installation is that the dishwasher is sitting on top of its own drain hose, pinching it shut.
The next most common reason is that the drain hose is either not connected to an air gap, or does not have a "high loop" where part of the drain hose is above where it is connected to the sink (see image).
Without either of these, water may backflow into the dishwasher and fail to drain correctly.
Make sure to install the drain hose according to local regulations, which may vary.
You'll also want to make sure it's not kinked or bent, especially if there's been any recent changes to the drain hose or its connection to the sink. If it's kinked or bent, straighten it out.