Quick answer
If your dishwasher won't start or fills with too much water, the float switch might be faulty. First, ensure the dishwasher is empty and turn off the power. Then, check the float switch for any obstructions or damage. If necessary, replace the float switch following the steps below.
Confirm the symptom
- Dishwasher won't start or fill with water.
- Dishwasher overflows with water.
- Dishwasher stops mid-cycle.
- Error code related to water level on display.
- Float switch is stuck or not moving freely.
- No water entering the dishwasher.
Tools and prep
- Screwdriver (Phillips or flathead, depending on your model)
- Multimeter (for testing the float switch)
- Replacement float switch (if needed)
- Towel to soak up any water
- Turn off power to the dishwasher at the circuit breaker
- Ensure the water supply valve is turned off
Step-by-step troubleshooting
- Access the Float SwitchDo: Remove the lower kickplate or front panel of the dishwasher to access the float switch, usually located at the bottom of the dishwasher tub.Observe: Check for any debris or obstructions around the float switch.Means: The float switch should move freely up and down.Next: Clean or replace the float switch as needed.
- Inspect the Float SwitchDo: Lift the float switch manually to see if it triggers the shut-off mechanism.Observe: If the float switch is stuck or does not move freely, it may need to be replaced.Means: The float switch should activate the shut-off mechanism when lifted.Next: Test the float switch with a multimeter.
- Test the Float SwitchDo: Use a multimeter to test the continuity of the float switch.Observe: Set the multimeter to the ohms setting and touch the probes to the terminals of the float switch.Means: If there is no continuity when the float is down and continuity when the float is up, the switch is working. If not, it needs replacement.Next: Replace the float switch if necessary.
- Replace the Float SwitchDo: Disconnect the wiring from the old float switch.Observe: Note the wiring configuration for proper reconnection.Means: Ensure the dishwasher is unplugged or power is off at the breaker.Next: Install the new float switch.
- Install the New Float SwitchDo: Connect the wiring to the new float switch according to the noted configuration.Observe: Ensure all connections are secure.Means: The float switch should be properly aligned and secured in place.Next: Reassemble the dishwasher.
- Reassemble the DishwasherDo: Replace the kickplate or front panel and secure it in place.Observe: Ensure all panels are properly aligned and secured.Means: The dishwasher should look and function as it did before disassembly.Next: Test the dishwasher.
- Test the DishwasherDo: Turn the power back on and run a test cycle.Observe: Monitor the dishwasher for proper operation.Means: The dishwasher should fill with water and operate normally.Next: If issues persist, consult a professional.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Float Switch Stuck Debris or foreign objects can obstruct the float switch, preventing it from moving freely. | Common | Easy | Cleaning |
| Faulty Float Switch The float switch may wear out over time and fail to operate correctly. | Sometimes | Easy–Medium | Replacement Float Switch |
| Wiring Issues Loose or damaged wires can prevent the float switch from functioning properly. | Sometimes | Medium | Wiring Repair Kit |
| Control Board Malfunction A faulty control board can send incorrect signals to the float switch. | Rare | Hard | Control Board |
| Water Inlet Valve Problems Issues with the water inlet valve can affect the water level and trigger the float switch. | Sometimes | Medium | Water Inlet Valve |
| Drainage Issues Poor drainage can cause water to accumulate, triggering the float switch. | Sometimes | Medium | Drain Hose or Pump |
Parts matching
Ensure you have the correct replacement parts before starting the repair. Here are the common parts you might need:
- Replacement Float Switch
- Screwdriver Set
- Multimeter
- Wiring Repair Kit
- Control Board
- Water Inlet Valve
- Drain Hose or Pump
Always double-check the model number of your dishwasher to ensure compatibility with replacement parts.
When to call a professional
- If the float switch appears to be working but the dishwasher still malfunctions.
- If you encounter complex wiring issues.
- If the control board needs replacement.
- If you are not comfortable performing the repair yourself.
- If the dishwasher continues to malfunction after attempting the repair.
- If water leakage or flooding occurs during the repair process.
FAQ
How do I know if my float switch is faulty?
If your dishwasher won't start or fills with too much water, and the float switch is stuck or not moving freely, it may be faulty. Use a multimeter to test for continuity.
Can I replace the float switch myself?
Yes, replacing the float switch is a relatively simple task that most homeowners can handle. Follow the steps outlined above for a safe and effective repair.
What if the float switch is not the problem?
If the float switch is working correctly but the dishwasher still malfunctions, there may be other issues such as a faulty water inlet valve, drainage problems, or a malfunctioning control board. Consult a professional if necessary.