To check if your hose is clogged, remove the hose from the drain connection and try flushing it out with a garden hose. If water doesn't flow freely through the hose, there may be a blockage. In most cases, you can clear a clogged drain hose using a plunger or a plumber's snake. Simply inserting either of these tools into the hose and moving it around should dislodge any debris causing the blockage. However, if the problem persists, you may need to call a plumber to clear the line.