Why Dishwashers Break Down
Clogged filters and drain pathsFood, labels and broken glass collect in the filter assembly and the sump. A clogged filter is behind many not-draining and not-cleaning calls, and it is the first thing a technician checks.
Drain pump and drain hoseThe drain pump pushes water out through a hose that loops up under the counter. A failed pump, a kinked hose or a blocked disposal connection leaves water in the tub.
Water inlet valveAn electric valve under the dishwasher lets water in. When it sticks or its screen clogs, the dishwasher fills slowly, not at all, or keeps filling.
Door latch and switchesA dishwasher will not start unless the door latch tells the control it is closed. Worn latches and switches are a common cause of a dishwasher that does nothing.
Heating and drying partsMany dishwashers heat water with an element in the tub and use heat, a fan or condensation to dry. A failed element or thermostat leaves dishes cold and wet.
Seals and hosesDoor gaskets harden, tub seals wear and hose clamps loosen. Leaks usually start small, under the door or behind the kick panel, before they show on the floor.
What a Technician Checks
Filter and sumpMost dishwashers have a filter assembly at the bottom of the tub that catches food and debris. A technician pulls it, cleans the sump beneath it and checks for glass or bones before replacing any parts, because a clog can make a healthy pump look broken.
Drain pumpIf water stays in the tub after a cycle, the drain pump is tested for power and blockages. Some pumps hum but cannot move water because something is caught in the impeller.
Drain hose and disposal connectionThe drain hose usually runs in a high loop under the counter or to an air gap, then into the disposal or sink drain. A kink, a clog or a new disposal with its knockout plug still in place stops the water.
Water inlet valveAn electric valve meters fresh water into the tub. A technician checks its screen for debris and tests the coil when the dishwasher fills slowly, does not fill, or overfills.
Float and overfill protectionA float rises with the water level and trips a switch to stop the fill. A stuck float can stop the dishwasher from filling at all or let water run too long.
Wash motor and spray armsThe circulation pump forces water through the spray arms. Weak spraying, clogged arm holes or a motor that hums without washing leave dishes dirty.
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Helpful Guides
- Dishwasher Repair Cost: What Common Repairs Run
- How Long Do Dishwashers Last? Repair or Replace
- Dishwasher Not Draining: Causes and Fixes
- Dishwasher Not Cleaning Dishes: Causes and Fixes
- Dishwasher Leaking: Where It Comes From and Fixes
- Dishwasher Not Drying Dishes: What to Check
- Dishwasher Not Filling With Water: Causes
- Dishwasher Smells Bad: Causes and How to Fix It