Common Dishwasher Problems We Fix

Homeowners in Wilmington often encounter similar signs of trouble. We have detailed the most frequent issues below so you can better understand what might be happening with your appliance.

Dishes Coming Out Dirty or Spotted

You run a full cycle only to find food particles baked onto plates or a cloudy film on your glasses. The dishes may feel gritty to the touch or look worse than when you put them in. This defeats the purpose of the appliance and forces you to wash everything by hand. It usually indicates that water is not circulating with enough force or that the water temperature is too low to dissolve detergent effectively.

Likely causes:

• Clogged spray arm holes blocking water jets
• Broken or stripped chopper blade failing to grind food
• Circulation pump impeller damage reducing water pressure
• Burned out heating element preventing hot water cycles
• Malfunctioning inlet valve not letting enough water in
• Detergent dispenser door failing to open

How we diagnose it:
We verify the water temperature inside the tub to ensure it reaches the necessary heat for sanitation. We inspect the spray arms for rotation and clear any debris from the jet holes. We also listen to the circulation pump to ensure it is generating adequate pressure. Checking the filters and the chopper assembly allows us to see if debris is recirculating onto the dishes.

What you can do right now:
Check the spray arms to ensure they spin freely and are not blocked by tall plates. Clean the manual filter at the bottom of the tub to remove trapped food particles. Run the hot water at your kitchen sink before starting the dishwasher to ensure the cycle starts with hot water.

Dishwasher Not Draining Water

Opening the dishwasher door to find a pool of gray, standing water at the bottom of the tub is a very common issue. This standing water can develop a bad odor quickly and may leak out if the door seal is not perfect. It indicates that the water used during the cycle is unable to exit the machine, preventing the cycle from finishing and leaving dishes unsanitary.

Likely causes:

• Blocked drain hose or air gap at the sink
• Failed drain pump motor
• Broken impeller inside the drain pump
• Clogged check valve allowing dirty water to flow back in
• obstruction in the garbage disposal knock out plug
• Electronic control board failing to send power to the pump

How we diagnose it:
We listen for the hum of the drain pump during the drain cycle. If the pump runs but water does not move, we check for physical blockages in the hose and sump area. We test the pump winding resistance with a multimeter. We also inspect the check valve to ensure it opens and closes correctly to prevent backflow from the sink.

What you can do right now:
Inspect the drain filter at the bottom of the unit and remove any large debris. If you have an air gap on your sink, check if it is blowing water or clogged. Ensure your garbage disposal is clear, as many dishwashers drain through the disposal unit.

Leaking Water onto the Floor

Water pooling in front of the dishwasher or seepage damaging the cabinetry next to the unit is a serious concern. Leaks can cause significant floor damage and mold growth if not addressed immediately. You might see water dripping from the corners of the door or coming from underneath the machine. This often happens during specific parts of the cycle like filling or draining.

Likely causes:

• Worn or torn door gasket seal
• Loose hose clamp on the water inlet or drain line
• Crack in the plastic tub or pump housing
• Defective water inlet valve sticking open
• Leaking pump seal
• Using the wrong type of soap causing excessive suds

How we diagnose it:
We remove the toe kick panel and observe the machine while it runs to pinpoint the source of the drip. We inspect the door seal for rips or compression issues. We check the water inlet valve for slow drips that happen even when the machine is off. We also look for evidence of oversuds which can force water out of the vent.

What you can do right now:
Stop using the machine immediately. Verify you are using automatic dishwasher detergent and not regular dish soap. Check the door gasket for any visible tears or food debris preventing a tight seal.

Dishwasher Not Starting or No Power

You press the start button and nothing happens. The lights might not turn on, or the lights may be on but the cycle refuses to begin. This is frustrating because it leaves you with a full load of dirty dishes and no way to wash them. It can be a simple setting issue or a complete electrical failure within the unit.

Likely causes:

• Tripped circuit breaker or blown fuse
• Broken door latch or door switch
• Thermal fuse blown due to overheating
• Faulty user interface or touchpad
• Main control board failure
• Wiring harness damage

How we diagnose it:
We test for power entering the machine at the junction box. We use a multimeter to check the continuity of the door switches, as the machine will not start if it thinks the door is open. We inspect the thermal fuse and test the control board for outgoing voltage signals to the various components.

What you can do right now:
Check your home circuit breaker panel to ensure the switch has not tripped. Ensure the door is closed firmly and the latch clicks. Check if the “Child Lock” or “Control Lock” feature is accidentally activated on the panel.

Loud or Strange Noises

Dishwashers are designed to be relatively quiet, so a sudden grinding, thumping, or high pitched squeal is alarming. These noises usually happen during specific phases like washing or draining. A grinding noise often implies hard debris in the pump, while a rhythmic thumping usually means a spray arm is hitting a dish.

Likely causes:

• Hard object like glass or bone stuck in the chopper
• Worn out wash motor bearings
• Spray arm hitting tall items or silverware
• Drain pump oscillating due to wear
• Loose mounting brackets causing vibration

How we diagnose it:
We identify when the noise occurs in the cycle to isolate the component. If it happens during the wash, we inspect the wash motor and chopper assembly. If it happens during draining, we check the drain pump. We inspect the interior for any loose components or items that have fallen out of the racks.

What you can do right now:
Open the door and spin the spray arms by hand to see if they hit any dishes. Check the bottom of the tub for loose utensils or hard debris like olive pits or glass shards.

Dishes Not Drying Properly

When the cycle finishes, you expect dry dishes. Finding them dripping wet means you have to towel dry everything by hand. This issue is common in modern energy efficient models that rely on condensation drying, but it can also signal a failure in the active heating components of the machine.

Likely causes:

• Burned out heating element
• Empty rinse aid dispenser
• Vent fan failure
• High limit thermostat cutting power to the heater
• Control board relay failure

How we diagnose it:
We test the heating element for continuity to ensure the electrical path is unbroken. We inspect the rinse aid dispenser for leaks or mechanical failure. We also check the vent fan operation if the model is equipped with one to ensure humid air is being evacuated.

What you can do right now:
Ensure the rinse aid dispenser is full, as this is critical for drying in modern units. Try using the “Sanitize” or “High Temp” option to increase the final rinse temperature, which aids evaporation.

Cycle Times Are Excessively Long

If your dishwasher runs for four or five hours, something is wrong. While modern eco-cycles are longer, an excessive run time usually indicates the machine is waiting for conditions that are not being met, such as water temperature. This wastes energy and prevents you from running multiple loads in a day.

Likely causes:

• Malfunctioning temperature sensor or thermistor
• Heating element not working, forcing extended water heating
• Clog in the self cleaning filter slowing water flow
• Control board software error
• Inlet valve flowing too slowly

How we diagnose it:
We check the resistance values of the temperature sensor. We verify the incoming water temperature and the heater operation. If the machine takes too long to fill, we inspect the inlet valve screens for sediment blockage.

What you can do right now:
Run hot water at the sink before starting the cycle. This prevents the dishwasher from spending extra time heating cold water from the pipes.

Bad Odors from the Dishwasher

A dishwasher should smell clean, not like mildew, sewage, or rotting food. A foul odor greeting you when you open the door is unpleasant and unsanitary. This usually stems from organic matter building up in hidden crevices or standing water that has gone stagnant.

Likely causes:

• Clogged filters holding rotting food
• Grease buildup in the door gasket folds
• Incorrect drain hose installation allowing sink backflow
• Standing water in the sump

How we diagnose it:
We inspect the installation of the drain hose to ensure it has a proper high loop or connection to an air gap. We disassemble the filter housing and sump area to deep clean hidden buildup. We check for mold growth in the door seals and sound dampening insulation.

What you can do right now:
Clean the filters thoroughly with hot soapy water. Wipe down the door gasket and the bottom lip of the door. Run a cleaning cycle with a dishwasher cleaner or a cup of vinegar placed on the top rack.