Bosch Dishwasher Error Code Er:04

Er:04 is a fatal door actuation error indicating the dishwasher cannot confirm proper door latch operation. The fault can be caused by a mechanical latch problem, a wiring harness issue, a defective triac, or a stuck door relay on the control board. Because it is classified as a fatal error, the dishwasher will not start or resume a cycle until the condition is corrected.

No. Er:04 is a fatal error, which means the dishwasher will not operate while the code is active. Attempting to force the appliance to run with a faulty door latch circuit is not safe, as a proper door seal is required to contain water and heat during the wash cycle. The error must be diagnosed and corrected before normal use can resume.

Repair costs vary depending on the failed component. A door latch assembly replacement is typically the least expensive fix, often ranging from $50 to $150 in parts plus labor. Control board replacement, which is required if the triac or relay has failed, is more costly and can range from $150 to $400 or more depending on the model and service rates in your area.

Start by firmly closing the door and confirming the latch clicks into place, then inspect the latch strike for obstructions or damage. Next, check the wire harness running from the door latch to the control board for any visible breaks, pinched wires, or loose connectors. If those steps do not resolve the error, the door latch assembly itself or the main control board may need to be replaced.

A reset may temporarily clear the displayed code, but because Er:04 is caused by an underlying mechanical or electrical fault, the error will return as soon as the dishwasher attempts to verify the door latch again. A permanent fix requires addressing the root cause, whether that is the latch mechanism, the wire harness, or a component on the control board.