A dishwasher that won’t drain is a major kitchen headache. If you see standing water in the bottom of your machine after a cycle, the culprit is often a drain hose choked with solidified grease and food debris. Over time, fats and oils from your plates cool down and cling to the plastic walls of the hose, eventually creating a stubborn blockage.
Residual dishwashing detergent (alkaline, pH 10–12) reacts with animal or vegetable fats to form (saponification). This creates a waxy, grayish-white deposit that is harder than raw grease and more resistant to hot water. dishwasher drain hose clogged with grease
Water in dishwasher? ↓ Run diagnostic → error code? ↓ Disconnect hose at disposal end → blow through it? ↓ NO (blocked) ↓ YES (clear) ↓ ↓ Remove hose → inspect inside Check pump impeller ↓ or air gap Grease plug? → Replace hose ↓ Reinstall with high loop & hot water flush monthly A dishwasher that won’t drain is a major kitchen headache
: Implement monthly hot-water flushing and educate tenants on grease disposal. Consider retrofitting dishwashers with smooth-bore hoses and insulation. ↓ Run diagnostic → error code
Run a Monthly Cleaner: Use a commercial dishwasher cleaner or a bowl of vinegar on a hot cycle once a month to melt away oily films before they become clogs.
Ignoring a partially clogged grease hose leads to:
: If you see standing water in the dishwasher, do not run it again. Disconnect the drain hose and inspect. In 80% of cases, replacing the hose ($15–25) is cheaper than a service call and resolves the issue permanently.