A Bosch 800 Series dishwasher that suddenly won’t start can be frustrating, especially when the control panel appears unresponsive or the cycle refuses to begin. The issue may be caused by something simple, such as a door not being fully closed, or something more complex, such as a power, control board, or component failure.

This guide explains the most common reasons a Bosch 800 Series dishwasher won’t start and provides step-by-step troubleshooting solutions.

Quick Checks Before Troubleshooting

Before investigating technical problems, check these basic issues:

• Make sure the dishwasher is connected to power.
• Confirm the door is fully closed and latched.
• Check whether the dishwasher is in Child Lock mode.
• Verify that the water supply valve is open.
• Make sure a delayed start option has not been activated.

Many Bosch dishwashers will not begin a cycle until all safety conditions are satisfied.

1. The Dishwasher Door Is Not Properly Latched

One of the most common reasons a Bosch 800 Series dishwasher will not start is an improperly closed door.

Bosch dishwashers include a door safety switch that prevents operation if the latch is not engaged. Even if the door appears closed, the latch mechanism may not be making contact.

How to fix it:

1. Open the dishwasher door.
2. Remove any dishes or racks blocking the door.
3. Close the door firmly until you hear the latch engage.
4. Press the Start button again.

If the dishwasher starts only when you push firmly on the door, the latch assembly or door alignment may need attention.

2. Child Lock Is Activated

Bosch 800 Series models often include a control lock feature that disables buttons to prevent accidental operation.

Signs of Child Lock:

• Buttons do not respond.
• The dishwasher appears powered on but will not start.
• A small lock icon may appear on the display.

How to disable Child Lock:

The exact button combination depends on your model. Common methods include:

• Holding the Start button for several seconds.
• Holding buttons labeled Control Lock or marked with a lock symbol.

Check your dishwasher’s user manual for the exact procedure.

3. Dishwasher Has No Power

If your Bosch dishwasher shows no lights or display activity, it may not be receiving power.

Check the following:

Circuit breaker

Locate your home electrical panel and check whether the dishwasher breaker has tripped. Reset it if necessary.

Power connection

If the dishwasher was recently installed or moved, check whether the power connection is secure.

Outlet or electrical supply

Some Bosch models are hardwired, while others use a power cord. A failed outlet, loose connection, or electrical issue can prevent startup.

4. The Dishwasher Needs a Reset

Electronic controls can occasionally freeze or become unresponsive.

A reset may restore normal operation.

How to reset a Bosch 800 Series dishwasher:

1. Turn off the dishwasher.
2. Disconnect power by unplugging it or switching off the circuit breaker.
3. Wait about 5 minutes.
4. Restore power.
5. Select a wash cycle and press Start.

If the dishwasher works after resetting but fails again later, the underlying issue may require further diagnosis.

5. Delayed Start Is Enabled

Bosch dishwashers can be programmed to start later. If this feature is accidentally activated, the dishwasher may appear not to start.

Check for:

• A countdown timer on the display.
• A delayed start indicator.

Fix:

Cancel the delayed start setting and select a normal wash cycle.

6. Water Supply Problem

A Bosch dishwasher will not begin a wash cycle if it cannot receive water.

Check:

• The water supply valve under the sink is open.
• The inlet hose is not kinked.
• The water pressure is adequate.

A dishwasher may power on normally but refuse to proceed if the water inlet system detects a problem.

7. Faulty Door Latch or Door Switch

If the door closes correctly but the dishwasher still refuses to start, the door latch sensor may be defective.

Possible symptoms:

• The dishwasher starts only when pressing the door inward.
• The Start button works but the cycle immediately stops.
• The display functions normally but the wash cycle never begins.

A faulty latch assembly may need replacement.

8. Control Panel or Touch Buttons Are Not Responding

Bosch 800 Series models often use touch controls. If the panel is unresponsive:

Try:

• Cleaning the control panel with a dry cloth.
• Resetting the dishwasher.
• Checking whether only certain buttons fail.

If only some buttons work, the control panel or user interface module may have failed.

9. Error Codes on the Display

If your Bosch 800 Series dishwasher displays an error code, it can help identify the problem.

Common examples include:

Error	Possible Issue
E15	Water leak protection activated
E24	Drain issue
E25	Drain pump blockage
E01/E02	Electronic control issue

The exact codes vary by model, so confirm the meaning using your model’s manual.

When to Call a Professional

Consider professional service if:

• The dishwasher has no response after a reset.
• The control panel is completely dead.
• The door latch needs replacement.
• The dishwasher repeatedly shows error codes.
• Electrical components require testing.

Working on internal electrical components can be dangerous without proper tools and experience.

Bosch 800 Series Dishwasher Won’t Start: Troubleshooting Checklist

Before scheduling service, confirm:

✅ Door is fully latched
✅ Child Lock is disabled
✅ Dishwasher has power
✅ Circuit breaker is on
✅ Delay Start is canceled
✅ Water supply is open
✅ Dishwasher has been reset
✅ No error codes are displayed

Final Thoughts

A Bosch 800 Series dishwasher that won’t start is often caused by a simple issue such as a locked control panel, incomplete door latch, or temporary electronic glitch. Performing basic checks and a reset can resolve many problems quickly.

If the dishwasher remains unresponsive after troubleshooting, the problem may involve the door latch, control module, or another internal component requiring repair.

For the best results, always use your dishwasher’s exact model number when looking up repair instructions or replacement parts.