Common Dishwasher Problems We Fix

Dishes Come Out Dirty or Gritty

The primary purpose of a dishwasher is to clean and sanitize but sometimes you open the door to find food particles baked onto your plates or a gritty residue inside the cups. This is frustrating because it often means running the load again or washing everything by hand. This issue is frequently caused by poor water circulation or low water temperature.

Likely causes:

• Clogged wash arm jets blocking water spray
• Filter assembly is full of debris
• Circulation pump impeller is damaged
• Inlet valve not letting enough water in
• Detergent dispenser failing to open
• Water temperature is too low to dissolve soap

How we diagnose it:

We start by inspecting the spray arms for blockage and ensuring they spin freely. We check the water level at the start of the cycle to ensure the pump has enough water to generate pressure. We also test the heating element and the thermostat to verify the water is reaching the optimal temperature for enzymatic detergents to work. We inspect the chopper blade assembly if your model has one to ensure it is processing food waste correctly.

What you can do right now:

Remove the bottom rack and inspect the filter at the base of the tub. If it is covered in food waste clean it out under running water. Check the holes in the spray arms for seeds or glass shards. Run the hot water at your kitchen sink before starting the dishwasher to ensure hot water enters the unit immediately.

Dishwasher Is Not Draining

Standing water in the bottom of the dishwasher is one of the most common calls we receive. It creates a sanitation issue and can lead to unpleasant odors if left sitting. If the water does not evacuate after the cycle it usually points to a blockage or a failure in the drain system.

Likely causes:

• Food obstruction in the drain pump
• Clogged drain hose or air gap
• Garbage disposal knockout plug not removed (new installs)
• Failed drain solenoid
• Broken drain pump motor
• Check valve stuck closed

How we diagnose it:

We listen to the sound of the drain pump during the cancellation cycle. A humming sound usually indicates a jam while silence suggests an electrical failure. We inspect the drain hose path for kinks and check the connection to the sink or garbage disposal. We test the drain pump resistance with a multimeter to see if the motor windings have failed.

What you can do right now:

Check the filter in the bottom of the tub for large debris. If you have a garbage disposal run it to ensure the drain path is clear. If you have an air gap cylinder on your sink counter check if water is spurting out of it which indicates a clog in the line to the disposal.

Water Leaking on the Floor

A leak from a dishwasher can cause significant damage to your subfloor, cabinetry, and kitchen flooring. Leaks can occur from the front door area or from underneath the unit where they might go unnoticed for weeks. Identifying the source of the water is critical to preventing further home damage.

Likely causes:

• Worn or torn door gasket
• Loose hose connection on the inlet or drain
• Cracked water inlet valve body
• Leaking circulation pump seal
• Dispenser leaking from the door panel
• Using the wrong type of soap causing suds
• Unit is not level causing water to slosh over

How we diagnose it:

We remove the toe kick panel at the bottom of the unit and observe the machine during a fill cycle. We use a flashlight to look for drips coming from the pump housing or valve connections. We inspect the door seal for rips, cracks, or embedded food particles that prevent a tight seal. We also check the float switch to ensure it shuts off the water at the correct level.

What you can do right now:

Stop using the appliance immediately. Wipe up any standing water. Check the door seal for any obvious damage. verify that you are using automatic dishwasher detergent and not regular dish soap which creates excessive suds that force water out of the door vent.

Dishwasher Will Not Start

You load the dishes and press the start button but nothing happens. The lights might be on or the panel might be completely dark. This dead unit syndrome can be caused by simple power issues or complex electronic failures.

Likely causes:

• Door latch or switch failure
• Thermal fuse blown
• Main control board failure
• User interface or touchpad ribbon cable issue
• Child lock feature is engaged
• Breaker tripped in the electrical panel

How we diagnose it:

We test the door switch for continuity to ensure the machine knows the door is closed. We check the thermal fuse which is a safety device designed to cut power if the unit gets too hot. We test for incoming voltage at the junction box. If power is present but the unit is unresponsive we test the user interface and main control board.

What you can do right now:

Check your home circuit breaker to ensure it has not tripped. Try to reset the breaker by flipping it off and back on. Ensure the door is latched firmly. Check if the “Control Lock” light is illuminated on the panel and hold the lock button for three seconds to disengage it.

Loud or Strange Noises

Dishwashers make a consistent hum during operation but loud grinding, thumping, or high pitched squealing noises are not normal. These sounds often indicate that a hard object is interfering with moving parts or that a motor bearing is failing.

Likely causes:

• Debris stuck in the chopper blade
• Hard object like a bone or glass in the pump
• Wash arm hitting a tall plate or utensil
• Circulation pump motor bearings worn out
• Drain pump impeller broken
• loose mounting brackets

How we diagnose it:

We listen to when the noise occurs in the cycle. A noise during draining points to the drain pump while a noise during the wash cycle points to the circulation motor or wash arms. We inspect the pump housing for debris. We manually rotate the spray arms to check for clearance issues.

What you can do right now:

Open the door and spin the spray arms by hand to see if they are hitting a tall item. Remove any hard debris visible in the bottom of the tub. If the noise persists contact us to prevent permanent motor damage.

Dishwasher Is Not Filling With Water

If you start a cycle and hear the motor humming but no water enters the tub the dishes will not get clean. This can burn out the pump seals if the machine runs dry for too long. The issue is usually related to the water supply or the inlet valve.

Likely causes:

• Defective water inlet valve
• Float switch stuck in the “full” position
• Clogged screen on the inlet valve
• Water supply line is kinked
• Leak detection system has triggered a shutoff

How we diagnose it:

We check for voltage at the inlet valve solenoid. If the valve receives power but does not open it needs replacement. We inspect the float assembly to ensure it moves freely and clicks the microswitch. We check the base pan for water which on some models triggers a safety stop that prevents filling.

What you can do right now:

Lift the float mechanism in the bottom of the tub and see if it drops back down freely. Remove debris from around the float. Ensure the water supply valve under the sink is turned to the fully open position.

Dishes Are Not Drying

Opening the dishwasher to find dripping wet dishes requires you to hand dry everything before putting it away. While plastic items are naturally harder to dry ceramic and glass items should come out dry. This issue is often related to the heating system or the venting system.

Likely causes:

• Heating element burned out
• Vent wax motor failure
• Rinse aid dispenser is empty or broken
• High limit thermostat tripped
• Control board not sending power to heater

How we diagnose it:

We test the heating element for continuity. If the element is broken (open circuit) it cannot generate heat. We test the vent assembly which is supposed to open to let steam escape. We also check the rinse aid dosage mechanism as rinse aid is crucial for breaking the surface tension of water to aid drying.

What you can do right now:

Ensure the rinse aid dispenser is full. Use the “Heated Dry” or “Sanitize” option if available. Open the door slightly after the cycle finishes to let steam escape which helps the drying process.

Cycle Takes Too Long

If your dishwasher runs for four or five hours it is a sign that the machine is struggling to meet the cycle requirements. Most modern dishwashers extend the cycle if they cannot reach the target water temperature.

Likely causes:

• Incoming water is too cold
• Heating element is weak or failing
• Thermostat or turbidity sensor is dirty
• Self cleaning filter is clogged
• Control board software glitch

How we diagnose it:

We check the temperature rise during the wash cycle. If the water heats up too slowly the machine will pause the timer until the heat is sufficient. We clean and inspect the turbidity sensor which measures water clarity. If the sensor is dirty it may think the dishes are still dirty and extend the wash time.

What you can do right now:

Run the hot water at the sink before starting the washer. Clean the sensor area in the sump if accessible. Check if you have selected extra options like “Sanitize” or “High Temp Wash” which naturally extend cycle times.