My LG Dishwasher Won't Start: Troubleshooting Guide
Quick answer
Check if the dishwasher is receiving power, ensure the door is fully closed and latched, and look for error codes on the display. If the door latch is faulty, it may prevent the dishwasher from starting.
Confirm the symptom
- Dishwasher does not power on at all
- No response when pressing start button
- Door appears closed but dishwasher won't start
Tools and prep
- Screwdriver set — For removing panels and accessing internal components
- Multimeter — To test for electrical continuity and power supply
- Flashlight — To illuminate hard-to-see areas inside the dishwasher
- Socket wrench set — For removing screws and panels
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Prep & safety
- Unplug the dishwasher to ensure safety before inspecting internal components.
- Check the circuit breaker to ensure the dishwasher is receiving power.
Step-by-step troubleshooting
Check Power Supply
Do: Verify the dishwasher is plugged in and the circuit breaker hasn't tripped.
Observe: Power indicator light is on or the unit powers on when the door is opened.
Means: Dishwasher is receiving power.
Next: If no power, check the outlet and circuit breaker.
Inspect Door Latch
Do: Check if the door is fully closed and the latch is engaging properly.
Observe: Door closes securely and the latch clicks into place.
Means: Door latch is functioning correctly.
Next: If the latch is faulty, proceed to test it with a multimeter.
Test Door Latch Switch
Do: Use a multimeter to test the door latch switch for continuity.
Observe: Multimeter shows continuity when the door is closed.
Means: Door latch switch is working.
Next: If no continuity, the door latch switch may need replacement.
Check for Error Codes
Do: Look for any error codes displayed on the control panel.
Observe: Error code is visible on the display screen.
Means: There is a specific issue indicated by the error code.
Next: Refer to the user manual for the meaning of the error code and recommended action.
Inspect Control Panel
Do: Check the control panel for any visible damage or signs of water intrusion.
Observe: Control panel is dry and free of damage.
Means: Control panel is likely functioning properly.
Next: If damage is present, the control panel may need to be replaced.
Test Water Inlet Valve
Do: Use a multimeter to test the water inlet valve for continuity.
Observe: Multimeter shows continuity across the valve terminals.
Means: Water inlet valve is working correctly.
Next: If no continuity, the valve may need to be replaced.
Check Water Supply
Do: Ensure the water supply valve is fully open and there is no kink in the water supply line.
Observe: Water flows freely from the supply line.
Means: Water supply is not the issue.
Next: If water supply is restricted, adjust the valve or straighten the supply line.
Inspect for Blockages
Do: Check the drain hose and filter for any blockages or debris.
Observe: Drain hose is clear and the filter is free of debris.
Means: No blockages are preventing the dishwasher from starting.
Next: If blockages are found, clean the drain hose and filter.
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Power supply issue | The dishwasher is not receiving power from the outlet or circuit breaker. | High | Easy | None |
| Faulty door latch switch | The door latch switch is not engaging, preventing the dishwasher from starting. | High | Moderate | Door Latch Switch |
| Control panel malfunction | The control panel is not sending the correct signals to start the dishwasher. | Medium | Hard | Control Panel |
| Water inlet valve issue | The water inlet valve is not allowing water into the dishwasher. | Medium | Moderate | Water Inlet Valve |
| Blocked drain hose or filter | A clogged drain hose or filter is preventing the dishwasher from starting. | Medium | Easy | None |
| Error code issue | An error code is displayed, indicating a specific problem with the dishwasher. | Medium | Varies | Depends on error code |
| Faulty main control board | The main control board is not functioning correctly, preventing the dishwasher from starting. | Low | Hard | Main Control Board |
| Water supply issue | The water supply valve is closed or the supply line is kinked. | Low | Easy | None |
Parts matching
When replacing parts, ensure they are compatible with your specific LG dishwasher model. Check the model number on the appliance and match it with the part specifications.
- Door Latch Switch: model number and compatibility with your LG dishwasher
- Control Panel: model number and compatibility with your LG dishwasher
- Water Inlet Valve: model number and compatibility with your LG dishwasher
- Main Control Board: model number and compatibility with your LG dishwasher
Always refer to the user manual for specific part numbers and installation instructions.
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When to call a pro
- If the dishwasher still won't start after checking all the steps
- If you are unsure about testing electrical components
- If the control panel or main control board needs replacement
- If the error code indicates a complex issue that requires professional diagnosis
FAQ
Why won't my LG dishwasher start even though it's plugged in?
Check the circuit breaker to ensure it hasn't tripped. Also, verify the door is fully closed and the latch is engaging properly.
How do I test the door latch switch?
Use a multimeter to test for continuity. If there is no continuity when the door is closed, the switch may need to be replaced.
What should I do if I see an error code on the display?
Refer to the user manual for the specific error code and follow the recommended troubleshooting steps.
Can a clogged drain hose prevent the dishwasher from starting?
Yes, a blocked drain hose or filter can prevent the dishwasher from starting. Clean the hose and filter to resolve the issue.