How to Repair a Washing Machine that Overfills

water pouring into a washing machine.
What You'll Need
New rubber or plastic tubing
Pressure switch (if needed)
Pressure tubing (if needed)
Fill valves (if needed)

Knowing how to repair a washing machine that overfills can save you money because you will not have to hire a professional. An overfilling machine does not mean it's time for a replacement, it can usually be fixed with time and patience.

Step 1 - Determine Electrical or Mechanical Problem

Before you can make a repair, you must determine which type of problem you have to fix. You will need to differentiate between an electrical or mechanical problem. Turn on the washing machine and allow it to fill with water. Next, push the timer off using the knob. Then, pull the plug connected to the wall. If it is a mechanical problem, the water continues to fill. If it is an electrical problem, the water stops. Electrical problems are little more difficult to fix.

Step 2 - Check the Pressure Switch

open top-loading washing machine

If it is an electrical problem, start with the pressure switch. The pressure switch controls the water level. First unplug the washer. Next, find the console and open it. The pressure switch will have a small rubber tube attached and is usually clear or black. Pull off the tube. Take the new rubber or plastic tubing, and replace the one pulled off.

Blow pressure into the switch, listening for a click, followed by a second click when the pressure is released. The switch should be good but just to confirm, plug in the washer. As the water fills, inhale and blow pressure again. The water will stop filling if the switch is good. If it does not, replace the switch.

Step 3 - Check Pressure Tubing

If the switch is good, the next place to look is the pressure tubing which was originally pulled off the switch. Wipe off the end of the tube and blow air into it. Now the air is going down into the tank and there should be a little restriction. If there is difficulty moving air through the tube, the port or tank dome is clogged.

Step 4 - Unclog the Port or Tank Dome

gunked up electrical parts

There are a few ways to unclog the port or tank dome, depending on the manufacturer and style of washing machine. Some require the removal of the cabinet and tub, these repairs are best left to professionals.

Others require removal of a clamp, found outside of the tank. The pressure tube attached there must be removed. Once it is, the “gunk” will be visible. Take the hose to a sink and flush it clean using hot water. There may be additional “gunk” at the tank area. Use your toothbrush to clean out this area.

Step 5 - Replace Tube

If there is no problem pushing air through the tube, then the last step is to take a close look at the tube. There can be a small hole, worn areas, or even chew marks by small animals. If this is the case, your tube must be replaced.

If it is a mechanical problem, the most common problem is with the fill valve. This valve is found where the hot and cold hoses are attached to the washer.