If your dishwasher is cleaning poorly, check these:Water-inlet valveInternal filtersDrain valveSpray armsWater temperatureDetergent cup
cleaning problems are caused by the dishwasher not getting enough wash
water, so the water-inlet valve is often to blame. This valve is
usually at the bottom left or right of the dishwasher, behind the lower
access panel. It's the device with the main water line from the house,
a rubber tube to the dishwasher, and two wires attached to it.
a water-inlet valve is defective, you may hear the sound that's usually
referred to as "water hammer." If the water-inlet valve is defective,
you need to completely replace it.
Dishwasher Water Inlet Valve Replacement
Be sure to read and understand any instructions that come with the new water inlet valve.
Step 1. Disconnect the dishwasher from its power source.
Note: Dishwashers are usually wired directly to the home’s electrical
system. To disconnect the power, switch off the circuit breaker or
remove the fuse for the electrical circuit the dishwasher is attached
to. Try to turn the unit on after disconnecting the power to be sure
you were successful.
CAUTION: If you’re not sure you’ve shut off the power properly, DO NOT
CONTINUE. Call a qualified appliance repair technician to complete the
Step 2. Turn off the water supply to the dishwasher. This is usually
underneath the kitchen sink or in the basement or crawlspace near the
location of the dishwasher. Pliers may be helpful here.
Note: If there are no shut-off valves, you must shut the water off at the main water supply valve for your home.
Step 3. Remove the lower panel(s) of the dishwasher. These are usually
held by 2 to 4 screws at the upper and lower corners of the panel(s).
The inlet valve is usually near the front of the dishwasher. Attached
to the valve you’ll see: 2 or 4 wires, the water supply line from the
house and the water feed line that goes to the dishwasher.
Step 4. Remove the household water supply line from the valve. The line
is usually secured with a brass compression nut. The water supply line
is usually copper or braided stainless steel.
CAUTION: Water supply line may be hot.
Step 5. Remove the fitting from the valve the water supply line was
attached to. This fitting may be very difficult to remove. It may help
to put the valve into a vice in order to remove the fitting. If you
cannot remove it, replace it. The fitting is not an appliance part but
a plumbing part that is available at most hardware stores.
Step 6. Remove the screws holding the valve to the dishwasher frame.
Step 7. Label the wires to the valve so you’ll be sure to reattach them correctly.
Step 8. Remove the wires from the valve.
Step 9. Remove the clamp on the black rubber water discharge tube and pull the tube off of the valve.
Step 10. Reinstall the old fitting (or a replacement fitting if
necessary) onto the new valve the water supply line was attached to.
Use Teflon tape or pipe joint compound as a thread sealant. Make this
fitting tight to prevent leaks. Make sure that the fitting points in
the same direction as the old one so that the water supply line will
meet up with it properly.
Step 11. Install the new valve in the reverse order of the removal instructions.
Note: The water supply line is under high pressure. Be sure to tighten the fittings properly.
Step 12. Turn on the water to the machine, and check for and correct any leaks.
Step 13. Reinstall the access panel(s). Restore the power to the dishwasher and test.
Note: You may have to let the dishwasher run a few minutes before it reaches the next water fill cycle.
Every dishwasher has some type of filter to keep large food particles and foreign objects away from the pump assembly:
- Most modern dishwashers have self-cleaning filters that don't need any routine cleaning.
have filters in the bottom of the dishwasher that you need to
periodically clean. You don't need any tools to remove the filter, and
cleaning it is easy. Consult your owner's manual to determine which
type you have and its maintenance requirements.
If your filter is clogged, it may be causing the cleaning problem.
dishwashers have a valve (or gate) that should open only during
draining. If debris lodges in the valve, it can't close properly, so
water drains out during the wash cycle. Most dishwashers drain into the
garbage disposer. If yours does that, listen for water flowing into the
disposer during the wash cycle. If you can hear it then, the drain
valve may be clogged.
a spray arm at the bottom of your dishwasher--it may have a tall spray
tube mounted to the center of it. There may also be a spray arm located
directly beneath the upper rack of dishes and/or above the upper rack.
debris is blocking the holes in the spray arms where the water comes
out, it could cause cleaning problems. Regularly inspect each of the
spray arms and clean out the holes as necessary.
get the best cleaning results, the water entering your dishwasher needs
to be hot enough. Try running the hot water in your kitchen sink for
about 30 seconds before starting the dishwasher, to pre-heat it. Also,
if your dishwasher lets you select a higher wash or rinse temperature,
try that to see if it helps.
To check the temperature of the
hot water that comes from your kitchen faucet use a waterproof
thermometer. If the water isn't 120 degrees Fahrenheit, your dishwasher
may have trouble getting your dishes clean. You could increase the
temperature of the hot water to the whole house--and therefore the
dishwasher--by adjusting the hot water heater thermostat.
Warning! To lessen the risk of scalding, don't set the hot water heater temperature higher than 120 degrees Fahrenheit.
don't perform their best if detergent is introduced only at the
beginning of a cycle, so add detergent to both parts of the cup.
If the detergent cup isn't opening, see the "The detergent cup doesn't open" section, below.