Are your dishes coming out of the dishwasher nearly as dirty as they went in? You could have a water pressure problem. If you ruled out a problem with the water pressure coming from your water lines, the problem could be in the pressure switch.
The pressure switch is a sensor that checks to see if enough water has entered into the tub and then cuts off the supply when that requirement is met. A faulty or failed pressure switch can turn off the water sooner than needed, which can leave you with dirty dishes.
If you feel comfortable performing appliance repairs, replacing a pressure switch isn't a difficult task. Don't feel comfortable at any step in the process? Call in an appliance service repairs company.
Things You Need:
Step 1: Turn Off Supply Lines
Turn off all electricity and water supply lines that tie into the dishwasher using the circuit breaker and the shut-off valve, respectively.
Place an empty bucket under the area where the water supply line connects to the shut-off valve. Twist the connecting point between the line and valve with a wrench until the line comes free. Some water will spill, but the bucket should catch it.
Disconnect the dishwasher's drain hose from either the sink drain or the garbage disposal. The hose should twist off easily with a wrench. Feed the hose through the hole in the cabinet so that it doesn't get snagged up when you remove the dishwasher.
Step 2: Unhook the Electrical Wires
Locate the lower access panel on the front of your dishwasher. Use a screwdriver to remove the fasteners holding the panel in place. You're now looking at the inner access panel. Use the screwdriver to remove the inner access panel's fasteners and carefully pull the access panel away, watching for sharp edges, and set it aside.
Now you're at the junction box cover. Remove its fasteners and pull the cover away and set aside.
Take a picture of the wires you now see to remember the location. Disconnect the wires by simply using your fingers to twist off the wire nuts, which look a bit like caps, and then removing the nut that's holding the wire bundle in place.
Step 3: Pull Out the Dishwasher
Remove the mounting screws on the interior of the dishwasher, which are the screws holding the entire unit in place. Make sure you have assistance standing by when you start this step.
Pull the dishwasher clear of the cabinet to perform the repair using assistance if the unit is too heavy for you to move on your own.
There is a panel of insulation on the side of the unit. Lift up that insulation and drape it over the top of the unit for safekeeping.
Step 4: Unhook Old Switch
Locate the pressure switch and note the notch below it, which is what fastens the switch into place. Press your screwdriver into the notch until you feel a switch give and then pull the switch free.
Take a picture of the wires on the pressure switch if you're worried about forgetting the position. Use a pair of pliers to unhook the wires. Use the pliers to twist the clamp off the attached pressure hose and then pull off the pressure hose.
Step 5: Install New Switch and Put Everything Back
Install the new switch by attaching first the pressure hose and its fastener and then the wires. Insert the pressure switch back into its position and make sure its fastener has triggered. Return the insulation layer and then return the dishwasher to its spot in the cabinets. Reattach the mounting screws making sure the screws are all present and secured tightly.
Reconnect the junction box wires and then its cover. Return the covers to the other access panels making sure all of the fasteners are secure.
Put the drain hose back on the sink or dishwasher and then reconnect the supply line to the shutoff valve. Turn on the electricity and water supplies.
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