LG Dishwasher Won't Start: Troubleshooting Guide
Quick answer
Check the power supply and door latch. If the dishwasher still won't start, look for error codes on the display and consult the manual. Reset the dishwasher by unplugging it for 1 minute.
Confirm the symptom
- Dishwasher does not power on
- No response when pressing start button
- Door appears closed but won't start
- No error codes displayed
- Dishwasher starts but immediately stops
Tools and prep
- Screwdriver — To access internal components
- Multimeter — To test electrical connections
- Flashlight — To inspect internal parts
- Socket wrench — To remove panels if needed
- Work gloves — For safety during inspection
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Prep & safety
- Ensure the dishwasher is unplugged or the circuit breaker is off before inspecting internal components.
- Wear work gloves to protect your hands during inspection.
Step-by-step troubleshooting
Check Power Supply
Do: Verify the dishwasher is plugged in and the circuit breaker hasn't tripped.
Observe: Power cord is connected and breaker is on.
Means: Power supply is functional.
Next: If power is confirmed, proceed to the next step.
Inspect Door Latch
Do: Check if the door is fully closed and the latch is engaged.
Observe: Door is closed and latch is secure.
Means: Door mechanism is functioning.
Next: If the door is closed and latched, move to the next step.
Look for Error Codes
Do: Check the control panel for any displayed error codes.
Observe: Error code is visible on the display.
Means: There is a specific issue indicated by the error code.
Next: Refer to the user manual for the error code meaning and proceed accordingly.
Reset the Dishwasher
Do: Unplug the dishwasher for 1 minute, then plug it back in.
Observe: Dishwasher powers on after being reset.
Means: The reset may have resolved a temporary issue.
Next: If the dishwasher starts, no further action is needed. If not, continue troubleshooting.
Test the Door Switch
Do: Use a multimeter to test the door switch for continuity.
Observe: Multimeter shows continuity when the door is closed.
Means: Door switch is functioning properly.
Next: If no continuity is detected, the door switch may need replacement.
Check the Control Board
Do: Inspect the control board for any visible damage or burn marks.
Observe: Control board appears undamaged.
Means: Control board is likely not the issue.
Next: If damage is found, contact a professional technician.
Inspect the Water Inlet Valve
Do: Check if the water inlet valve is receiving power and opening properly.
Observe: Valve is receiving power and opens when activated.
Means: Water supply is not the issue.
Next: If the valve is faulty, it may need to be replaced.
Test the Motor
Do: Use a multimeter to test the motor for continuity.
Observe: Multimeter shows continuity in the motor.
Means: Motor is functioning properly.
Next: If no continuity is detected, the motor may need replacement.
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Power Supply Issue | Dishwasher requires a stable power source to operate. | High | Low | Power cord or circuit breaker |
| Faulty Door Latch or Switch | The dishwasher will not start if the door is not properly closed. | High | Medium | Door latch or switch |
| Control Board Malfunction | A faulty control board can prevent the dishwasher from starting. | Medium | High | Control board |
| Water Inlet Valve Failure | If the valve is not receiving power, the dishwasher may not start. | Medium | Medium | Water inlet valve |
| Motor Failure | A non-functional motor can prevent the dishwasher from starting. | Low | High | Motor |
| User Error or Temporary Glitch | Sometimes a simple reset can resolve the issue. | High | Low | None |
Parts matching
When replacing parts, ensure compatibility with your LG dishwasher model.
- Door Latch: model number and size
- Door Switch: electrical specifications and mounting type
- Control Board: exact model number and firmware version
- Water Inlet Valve: voltage rating and connection type
- Motor: horsepower and mounting dimensions
Always refer to the user manual for specific part requirements and installation instructions.
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When to call a pro
- If the dishwasher still won't start after checking all power and door components
- If you detect a burning smell or visible damage to internal components
- If the control board shows signs of water damage or corrosion
- If you are unsure about testing electrical components
- If the issue involves replacing complex parts like the motor or control board
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, inspect the power cord for any damage.
What should I do if my dishwasher displays an error code?
Refer to the user manual for the specific error code meaning and follow the recommended troubleshooting steps.
Can a faulty door switch prevent the dishwasher from starting?
Yes, a faulty door switch can prevent the dishwasher from starting. Test the switch for continuity using a multimeter.
How do I reset my LG dishwasher?
Unplug the dishwasher for 1 minute, then plug it back in. This can resolve temporary glitches.
Is it safe to test electrical components myself?
Always ensure the dishwasher is unplugged or the circuit breaker is off before testing electrical components for safety.