When a Bosch dishwasher shows E03, the control has detected main control-board relay fault. The code narrows the diagnostic path but does not identify every cause by itself.
When a Bosch dishwasher shows E03, the control has detected main control-board relay fault. The code narrows the diagnostic path but does not identify every cause by itself.
Model compatibility: Bosch reuses codes across series and model years, so E03 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Why it happens
Possible causes
main control-board circuit fault
relay or switching fault within the control path
wiring or connected-load condition that the board detects
Important safety warning. Leave the appliance off if there is a burning smell, smoke, sparking, or a breaker that trips again.
Seeing this code on your Bosch appliance?
Book a specialist visit for a clear estimate and approval before any repair.
We organize Bosch repair across ten regional service areas — from the Westside, Valley, and South Bay through North, Central/Coastal, and South Orange County. Open Locations, pick your region, or send your ZIP code if you are unsure which page applies.
No. This site is for Bosch appliance repair routed through Southern California service areas — not a national dispatch desk covering every U.S. metro.
Request an appointment with your appliance model and symptom. We confirm a visit window, diagnose on site, then give a clear estimate. Approved work only proceeds after you agree.
Yes. You get an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work.
Yes. We diagnose and repair Bosch refrigerators, dishwashers, washers, dryers, ovens, cooktops, and coffee machines common in LA and Orange County homes.
Ready to get your Bosch appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
