Bosch Dishwasher Error Code E:30

E:30 means the dishwasher has detected high supply voltage and shut itself off as a protective measure. This code does not appear during the wash cycle and must be retrieved by running the test program after the shutdown. The acceptable supply voltage range is approximately 98 to 120 VAC. The issue is typically rooted in the home's electrical wiring or utility supply rather than the dishwasher's internal components.

No, you should not attempt to keep running the dishwasher until the overvoltage condition is resolved. High supply voltage can damage the dishwasher's control board, motor, and other electronic components if the machine is forced to operate. Address the electrical supply issue first before resuming normal use.

If the issue is limited to a loose wiring connection, the cost may be minimal, typically just the cost of an electrician's service call, which can range from $75 to $200 depending on your area. If the power module inside the dishwasher needs to be replaced after an overvoltage event caused damage, parts and labor combined can range from $150 to $400 or more. Costs vary based on your location, the specific technician, and whether any other components were affected.

Start by running the dishwasher's test program to confirm the E:30 code, then use a multimeter to measure the supply voltage at the appliance's wiring connection. If voltage is above 120 VAC, the problem lies in your home's electrical system and you should inspect wiring connections, the circuit breaker, and the main panel. If everything in the home checks out normally, contact your utility company to verify that service voltage at the meter is within range.

Resetting the dishwasher may temporarily clear the code, but E:30 will return as long as the underlying overvoltage condition in the electrical supply has not been corrected. The dishwasher will continue to shut down whenever it detects supply voltage outside the 98 to 120 VAC range. A permanent fix requires resolving the electrical issue in the home wiring or utility supply.