Reference guide
Thermador Oven · code E303
Code-specific guidance for E303
E303 should be documented with date, which function was active (bake, broil, burner, wash, dry), and any recent outages. For Oven service, that context speeds diagnostics on the first visit.
Avoid forcing high heat or bypassing safety interlocks to “test.” If you notice unusual odor, tripped breakers, or gas smell, stop use and call for help immediately.
Call 844-683-0648 for Thermador Support—share the code, the appliance type, and any recent kitchen work or outages.
What to track before you call
- Exact timing: note which cycle step, mode, or temperature setting triggered E303.
- Repeatability: record whether the code returns immediately after reset or only under heavier demand.
- Related symptoms: capture any unusual sounds, heat changes, leaks, smells, or electrical trips.
- Model details: keep model and serial ready so we can route the right parts and test path.
Contact Thermador Support for repair
For Thermador Oven repair and code E303, call 844-683-0648 or use our schedule appointment page to reach the same dispatch team.