The selector switch in a dishwasher determines which cycle is used. If a button on the switch does not work, that cycle will not function properly. Testing the selector switch can help identify if it needs to be repaired or replaced.
Caution: Please read our safety information before attempting any testing or repairs.
Important Safety Notice: Before testing the selector switch, unplug the dishwasher or shut off the power at the fuse box or breaker panel to avoid an electrical shock hazard.
Tools and Materials Needed
- Screwdriver (Phillips and flat-head)
- Multimeter
- Safety gloves
- Labels or masking tape (for labeling wires)
Steps to Test the Selector Switch
Step 1: Safety First
- Turn Off Power: Ensure that the dishwasher is unplugged or the circuit breaker is turned off to prevent any electrical shock.
Step 2: Access the Control Panel
- Close the Door: Start with the door closed and locate any screws on the front that must be removed. Usually, there are one or two screws near the latch; do not remove the latch itself unless necessary.
- Open the Door: Open the door and remove the screws near the top. On some dishwashers, these screws (labeled “B”) secure the control panel.
- Remove the Control Panel: If the control panel cannot be removed separately, you may need to remove the entire door panel. Remove the screws along both edges of the door (labeled “A” and “B”). There may be several screws near the bottom of the door that secure the door to the hinge mechanism; it should not be necessary to remove these screws. Carefully lift the panel off from the door. Check for any wires connected to the panel before lifting it out too far.
- Expose Control Components: Remove the control panel cover to expose the door’s control components. It may be held in place with additional screws or clips.
Step 3: Locate the Selector Switch
- Identify the Selector Switch: The selector switch is usually located on the control panel. It may be connected to several wires.
Step 4: Disconnect the Wires
- Label the Wires: Use labels or masking tape to mark the wires and their corresponding terminals for proper reconnection later.
- Remove Connectors: Firmly pull the connectors off the terminals. Do not pull on the wires. You may need to use needle-nose pliers to remove the connectors.
Step 5: Test for Continuity
- Set the Multimeter: Set your multimeter to the ohms setting (Ω) to test for continuity.
- Test the Terminals: Touch one probe to each terminal of the selector switch. Press each button on the selector switch and observe the multimeter readings.
- Normal Reading: A functioning switch will show continuity (a low resistance reading) when a button is pressed and no continuity (infinite resistance) when the button is not pressed.
- Faulty Switch: If the multimeter shows no continuity when a button is pressed or continuity when it is not pressed, the selector switch is faulty and needs to be replaced.
Steps to Replace the Selector Switch (if necessary)
Step 6: Replace the Selector Switch
- Remove the Old Switch: If the selector switch is faulty, remove it by unscrewing any mounting screws and carefully disconnecting any remaining connections.
- Install the New Switch: Install the new selector switch by connecting the wires to the correct terminals and securing it with mounting screws.
Step 7: Reassemble the Dishwasher
- Reattach the Control Panel Cover: Secure the control panel cover with screws or clips.
- Reattach the Door Panel: Replace the door panel by aligning it properly and securing it with screws along the edges.
- Close the Door: Ensure everything is properly aligned and close the dishwasher door.
Step 8: Test the Dishwasher
- Restore Power: Turn the power back on at the fuse box or breaker panel.
- Run a Test Cycle: Run a short test cycle to ensure the dishwasher operates correctly and the new selector switch functions properly.
Tips and Warnings
- Consult the Manual: Always refer to your dishwasher’s user manual for specific instructions related to your model.
- Use Genuine Parts: If the selector switch needs to be replaced, use genuine replacement parts for optimal performance and longevity.
- Seek Professional Help: If you are unsure about any step or if the problem persists, consider seeking help from a professional technician.
By following these steps, you can effectively test and, if necessary, replace the selector switch in your dishwasher, ensuring it operates correctly and efficiently. Regular maintenance and timely repairs will help extend the lifespan of your appliance.
