Unplug your dishwasher or turn off the circuit breaker before performing any manual checks on the hose or pump.
If all external components—filter, hose, and sink connection—are clear, the blockage must be inside the appliance itself: the drain pump or the internal sump. This is the most advanced repair. The drain pump is a small electric motor with an impeller that forces water out. Sometimes, a piece of glass or a toothpick jams the impeller. Accessing the pump typically requires removing the lower front kick panel and tilting the dishwasher forward. Once exposed, locate the pump (a small cylindrical unit attached to the hose). Remove the pump’s cover screws and inspect the impeller chamber. Clear any debris carefully. If the impeller spins freely but the pump makes a humming noise without draining, the pump motor has failed and requires replacement. Similarly, if the internal sump (the basin beneath the filter) has a crack or a blocked check valve, professional replacement may be the only option. how to fix a clogged dishwasher drain
Before you can troubleshoot the clog, you must remove the pooled water. Unplug your dishwasher or turn off the circuit
Start with the easiest fixes before grabbing your toolbox. The drain pump is a small electric motor
Use a cup and sponge (or a wet/dry vac) to remove any pooled water so you can access the drain area. Step-by-Step DIY Fixes How to Unclog a Dishwasher Drain in 5 Steps - Whirlpool