Short answerMost dishwasher calls involve water left in the tub because of a clogged filter or a failed drain pump, poor cleaning from scaled spray arms or a low fill, dishes that won't dry because the heater or rinse aid system isn't doing its job, or a leak at the door. The office books a time, the technician runs a cycle and tests the stage that's failing, and nothing is repaired until you approve the single price written up for it.
01Dirty water left in the tub when the cycle ends
Usually: Food scraps and broken glass collect in the filter beneath the lower spray arm, and when it packs full, water can't get to the drain pump. Beyond the filter, water also stays put if the pump has failed, the check valve is stuck, the hose is kinked, or a new garbage disposal still has its knockout plug in.
What we do: Twist out and rinse the filter yourself first; it solves more drain calls than any part. If water still sits, the technician cleans out the sump, inspects the hose along with its high loop or air gap, makes sure the disposal inlet is open, and tests the drain pump motor.
02Dishes come out dirty or gritty
Usually: Water isn't reaching the dishes with enough force or volume. Spray arm holes plug with scale and food, a dirty filter starves the wash pump, a scaled inlet screen shortens the fill, or the wash motor itself has weakened, and grit usually means food is recirculating past a damaged filter.
What we do: We check the fill level, clear and inspect the spray arms, test the wash motor and look at the filter seals. Incoming water temperature matters too, so we check how quickly hot water reaches the kitchen sink and whether the machine's heater is working.
03White film or cloudy glassware
Usually: A chalky film that comes off with vinegar is mineral scale from hard water, while a cloudy etch that won't come off is glass damage, often from too much detergent. Low rinse aid, a weak heater and underfilling all make scale worse.
What we do: We test the heater and fill volume, check that the rinse aid dispenser releases, and inspect the heating element and spray arms for scale. We also suggest detergent and rinse aid settings suited to your water.
04Dishes are still wet at the end
Usually: Older and many entry-level models dry with a heating element, while many newer ones, Bosch among them, rely on condensation and rinse aid, so an empty rinse aid dispenser leaves water everywhere. On heated models, drying stops when the element burns out or the high-limit thermostat fails.
What we do: We identify which drying system your model uses, test the element and thermostat, and confirm the rinse aid dispenser opens. Plastic stays wetter than glass in any dishwasher, and we'll tell you if what you're seeing is normal.
05Won't start, or lights blink and nothing happens
Usually: The door latch switch must confirm the door is shut before a cycle runs, and it is a frequent failure. A thermal fuse that has blown, or a fault in the control board, has the same effect, and some models refuse to start when a leak sensor in the base pan detects water.
What we do: We test the latch switch and its strike, check the fuse and the power supply to the control, and look in the base pan for water. If the leak float has tripped, the leak gets tracked down and repaired before the float is reset.
06Leaking onto the kitchen floor at the front
Usually: Water gets pushed out the front by a worn door gasket, by a cracked spray arm spraying the door vent, by suds from hand dish soap, or by an inlet valve that overfills. Under the machine, look to hose clamps, the pump seal and the inlet connection.
What we do: With the toe panel removed, we fill the tub and follow the drip to its source, check the gasket and door alignment, and test the inlet valve and float switch. Slow leaks under a dishwasher damage subfloors, so we check the floor beneath it as well.
07Won't fill, or hums while no water comes in
Usually: The inlet valve's small screen collects scale and well sediment until water barely gets through, or the valve's coil fails outright. A float switch stuck in the up position tells the machine it's already full.
What we do: We shut off the water, inspect and clean the valve screen, test the valve coil and float switch, and replace the valve if needed. Inlet valves are one of the common parts kept on our trucks.
08Grinding, humming or a loud buzz during the wash
Usually: Glass shards, fruit pits and bits of plastic get past the filter and lodge in the wash pump impeller or chopper. A worn wash motor bearing hums or squeals, and a drain pump with debris in it buzzes when it tries to run.
What we do: We open the sump, clear foreign objects, check the impeller and chopper blade for damage, and test both motors. If a pump is damaged, we write up its replacement price on the spot.