When your dishwasher stops responding, shows error codes, or behaves erratically like starting and stopping randomly or not powering on at all a faulty control board might be the issue. The control board is the “brain” of your dishwasher, and while a failure can seem daunting, you can often troubleshoot it yourself. In this guide, I’ll explain what causes control board failure, walk you through diagnosing and addressing the problem, and provide 10 FAQs to answer your questions.
What Causes Dishwasher Control Board Failure?
The control board, a circuit board inside the dishwasher, controls functions like starting cycles, regulating water flow, and managing the display. When it fails, the dishwasher may not work properly or at all. Common causes of control board failure include:
- Power surges: Voltage spikes from storms or outages can damage the board.
- Moisture exposure: Water leaks or steam can corrode electrical components.
- Wear and tear: Over time, the board’s circuits or connections can degrade.
- Overheating: Poor ventilation or heavy use can overheat the board.
- Manufacturing defects: Some boards fail due to faulty design or components.
- Loose connections: Wiring issues can mimic a board failure.
While replacing a control board can be expensive, troubleshooting can help you confirm the issue and decide whether to repair or replace it.
Tools and Materials You’ll Need
- Screwdriver (Phillips or flathead, depending on your dishwasher)
- Multimeter (for testing electrical components)
- Flashlight (optional, for better visibility)
- Dishwasher owner’s manual (for model-specific instructions)
- Replacement control board (if needed; check your manual for the part number)
- Towels or rags (in case of water spills)
- Anti-static wrist strap (optional, to prevent static damage to the board)
Step-by-Step Guide to Troubleshoot Dishwasher Control Board Failure
Step 1: Ensure Safety
Before working on your dishwasher:
- Unplug the dishwasher or turn off the power at the circuit breaker to avoid electric shock.
- Avoid touching the dishwasher if it’s wet or you’re standing in water.
Step 2: Check for Obvious Signs of Failure
Look for symptoms of control board failure:
- No power to the control panel (no lights or display).
- Error codes on the display (check your manual for code meanings).
- Buttons not responding or cycles starting/stopping randomly.
- Dishwasher not completing cycles or skipping steps (e.g., not draining). If these match your issue, the control board is a likely suspect, but rule out simpler problems first.
Step 3: Perform a Soft Reset
A reset can sometimes fix control board glitches.
- Unplug the dishwasher or turn off the breaker for 1–5 minutes to reset the board.
- Alternatively, check your manual for a control panel reset (e.g., press “Start/Reset” or a combination like “Heated Dry” + “Normal” for 3–5 seconds).
- Restore power and try running a cycle. If the problem persists, move on.
Step 4: Rule Out Other Common Issues
Before assuming the control board is faulty, check these components, as they can mimic board failure:
- Power supply: Verify the circuit breaker isn’t tripped and the GFCI outlet (if used) is reset. Check the power cord for damage or loose connections.
- Door latch: Ensure the door closes firmly, as a faulty latch can prevent power to the control panel.
- Thermal fuse: A blown thermal fuse can cut power. Locate it (usually near the control board or under the dishwasher) and test with a multimeter for continuity. Replace if blown.
- Control lock: Check if the panel is locked (hold the “Lock” button for 3–5 seconds to unlock).
If these are fine but the issue remains, proceed to inspect the control board.
Step 5: Access the Control Board
The control board is typically located behind the control panel or inside the door.
- Remove the screws along the top or sides of the dishwasher door (inner panel) to access the control panel. Refer to your manual for exact locations.
- Carefully lift or separate the panel to reveal the control board (a circuit board with wires and connectors).
- Place a towel under the dishwasher to catch any water drips.
Step 6: Inspect the Control Board
- Look for visible damage like burn marks, corrosion, melted components, or loose connectors.
- Check for a burnt smell, which indicates electrical damage.
- Gently wiggle the wiring harnesses to ensure they’re secure. Loose connections can cause issues.
Step 7: Test the Control Board (Advanced)
Testing the board requires a multimeter and some electrical knowledge:
- Disconnect the wiring harnesses from the board (label them for reassembly).
- Set the multimeter to continuity or resistance (ohms) and test key components like relays or capacitors for continuity (refer to your manual or a technician for specifics).
- If you’re not comfortable with electrical testing, skip to replacement or call a professional.
Step 8: Clean the Control Board (If Possible)
If you see corrosion or minor debris:
- Use a dry cloth or compressed air to gently clean the board. Avoid water or liquids.
- If corrosion is present (e.g., from a leak), a technician may need to assess if the board is salvageable.
- Reconnect all wires and test the dishwasher.
Step 9: Replace the Control Board (If Necessary)
If the board is damaged or testing confirms it’s faulty:
- Order a replacement control board using the part number from your manual or the old board. Purchase from a reputable appliance parts retailer or online.
- Disconnect all wires from the old board (take photos for reference).
- Remove the old board (usually held by screws or clips) and install the new one.
- Reconnect all wires exactly as they were, using your photos or labels.
- Use an anti-static wrist strap to avoid damaging the new board with static electricity.
- Reassemble the control panel and secure all screws.
Step 10: Test the Dishwasher
- Plug in the dishwasher or turn on the breaker.
- Run a short cycle to check if the control panel works, cycles run correctly, and no error codes appear.
- If the dishwasher still doesn’t work, double-check connections or consult a professional.
Step 11: Address Related Issues
Control board failure can be caused by underlying problems:
- Check for water leaks around the door or tub that might have damaged the board. Fix leaks with new gaskets or seals.
- Ensure proper ventilation to prevent overheating (avoid overloading circuits).
- Use a surge protector if power surges are common in your area.
Step 12: Prevent Future Control Board Issues
To protect your dishwasher’s control board:
- Unplug the dishwasher during storms or power outages to avoid surges.
- Check for and fix water leaks promptly to prevent moisture damage.
- Avoid overloading the electrical circuit with other appliances.
- Schedule annual maintenance to catch issues early.
10 FAQs About Dishwasher Control Board Failure
- How do I know if my dishwasher’s control board is faulty?
Signs include no power to the panel, error codes, unresponsive buttons, or cycles starting/stopping randomly. - Can I reset the control board to fix it?
Yes, unplugging the dishwasher or turning off the breaker for 1–5 minutes can reset it. Check your manual for panel reset instructions. - What causes a control board to fail?
Power surges, moisture exposure, overheating, wear and tear, or manufacturing defects are common causes. - Can I clean a control board to fix it?
You can clean minor corrosion or debris with a dry cloth or compressed air, but significant damage usually requires replacement. - How much does a replacement control board cost?
A new board costs $50–$200, depending on the model. Professional replacement may cost $150–$400. - Can a power surge damage the control board?
Yes, surges can fry the board’s circuits. Use a surge protector to reduce this risk. - Do all dishwashers have a control board?
Most modern dishwashers have a control board to manage electronic functions. Older models may have simpler mechanical controls. - Can a faulty door latch mimic control board failure?
Yes, a broken latch can prevent power to the panel, mimicking a board issue. Check the latch first. - How do I test a control board?
Use a multimeter to check continuity in the board’s components, but this requires electrical knowledge. Consult a technician if unsure. - When should I call a professional for control board issues?
If you’ve ruled out other issues, cleaned the board, or are uncomfortable with electrical work, a technician can diagnose or replace the board.
Final Thoughts
A dishwasher control board failure can feel like a big setback, but with this guide, you can troubleshoot and often fix the issue yourself. By resetting the dishwasher, checking other components, and inspecting or replacing the board, you can get your dishwasher running smoothly again. Regular maintenance, like preventing leaks and protecting against surges, can help avoid future problems. If you’re stuck or unsure about electrical work, the FAQs above should help, or consider calling a professional. Here’s to a dishwasher that works perfectly and dishes that come out sparkling clean!
