Use this E303 reference to understand electronics temperature difference too high, the symptoms worth recording, safe checks, and the point where model-specific testing is needed.
Use this E303 reference to understand electronics temperature difference too high, the symptoms worth recording, safe checks, and the point where model-specific testing is needed.
Model compatibility: Bosch reuses codes across series and model years, so E303 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Signs
Symptoms you may notice
the appliance may stop or limit a function
the code may return under the same operating condition
one feature can fail while others remain available
the exact behavior can vary between model generations
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Get help
When to call a technician
If the warning returns, use the exact model documentation to narrow the subsystem before any part is ordered. Do not choose the most expensive module from the code alone. The technician should verify the relevant circuit or mechanism before recommending a repair.
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.
