Bosch dishwashers are among the quietest on the market—so quiet that some homeowners can't tell if they're running. But when a Bosch dishwasher won't start at all, it's unmistakable. No lights, no response to buttons, or lights on but the cycle won't begin. Here's what our technicians check when they get this call.
No Power at All
Check the Basics
- Circuit breaker: Check your electrical panel. Bosch dishwashers are hardwired in many installations, so there's no plug to check—just the breaker.
- Junction box: If your Bosch is hardwired, the wire nuts in the junction box under the dishwasher can loosen over time, especially after the unit has been pulled out for service or a kitchen remodel.
- GFCI outlet: If your Bosch is plugged in (newer code-compliant installations), check if the outlet is GFCI-protected and needs to be reset.
Control Board Failure
If there's power to the unit but the display is completely dead, the main control board may have failed. Power surges—common during Santa Ana wind events that cause grid instability—are a leading cause of control board failures in our service area. A surge protector can prevent this. Replacement control boards for Bosch dishwashers run $250-$400 depending on the model.
Lights On, Won't Start a Cycle
Door Latch Issue
Bosch dishwashers won't start unless the door latch is fully engaged. The latch has both a mechanical component (the physical hook) and an electrical switch. If either fails, the dishwasher sees the door as open and refuses to start. Common signs include the door feeling "loose" when closed or needing extra force to latch. On some models, a worn door strike plate causes the latch to not fully engage.
Child Lock Activated
Many Bosch models have a child lock feature that disables all buttons. Look for a key icon on the display or a small LED indicator. To deactivate, press and hold the child lock button (varies by model—check your manual) for 3-5 seconds.
Delayed Start Set
The delayed start feature can be accidentally activated. If you see a time countdown on the display, press the Start button to cancel the delay and begin the cycle immediately.
Water Supply Issue
Some Bosch models won't start or will immediately abort the cycle if they detect no water supply. Check that the water valve under the sink is fully open. If the dishwasher starts but immediately stops with an E15 error, it has detected a leak in the base pan.
Common Bosch Error Codes
- E15: Water in the base pan (leak detected). Tilt the dishwasher forward slightly to drain the base pan, then investigate the leak source.
- E24/E25: Drainage issue. Check the drain hose and filter.
- E09: Heating element failure. Requires professional repair.
- E01/E02: Control board or wiring issue. Requires professional diagnosis.
When to Call TruePro
If the breaker is on, the door latches firmly, and the unit still won't respond, you likely have a control board, door latch switch, or wiring issue that needs professional diagnosis. Our technicians are experienced with all Bosch dishwasher models including the 100, 300, 500, and 800 series, as well as the Benchmark line.
Our dishwasher repair service includes same-day availability across Santa Monica, Glendale, and all of Southern California. 90-day warranty on every repair.