Thermador Range Moderate Severity
E303

E303 (also E305) – Range error code

Thermador Range error code

E303 on a Thermador range is often grouped with related E305 entries in manufacturer charts—both flag conditions the control ties to oven or burner electronics rather than a simple user setting.

Write down whether the oven cavity heats, whether broil works, and whether any burner fails to ignite before you reset repeatedly.

Call Thermador Support using the number on this site when the code persists or blocks cooking; we will help route the visit with the right context.

Call 844-683-0648 Reserve repair

At a glance

E303 on Thermador

  • ApplianceRange
  • SeverityModerate Severity
  • DIY checksTechnician advised

Book Thermador repair

Contact Thermador Support for repair at 844-683-0648—mention code E303 when you call.

844-683-0648 Schedule appointment

Related service

Thermador Range Repair

OEM or manufacturer-cleared parts when available · invoice-backed coverage when applicable

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Before the visit

Quick troubleshooting steps

  • Note the exact error code and any indicators (sounds, smells, leaks).

  • Try power cycling the appliance (unplug for 60 seconds).

  • Review the diagnostics notes in the reference guide below.

  • If the code returns, call Thermador Support at 844-683-0648.

Professional service recommended. This error often involves electrical or sealed-system components. For safety, we recommend professional diagnostics before further use.

Reference guide

Thermador Range · code E303

Code-specific guidance for E303

E303 on a Thermador range is often grouped with related E305 entries in manufacturer charts—both flag conditions the control ties to oven or burner electronics rather than a simple user setting.

Write down whether the oven cavity heats, whether broil works, and whether any burner fails to ignite before you reset repeatedly.

Call Thermador Support using the number on this site when the code persists or blocks cooking; we will help route the visit with the right context.

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 Range repair and code E303, call 844-683-0648 or use our schedule appointment page to reach the same dispatch team.

FAQ

Thermador service—answered clearly

Process, pricing, and what to expect during your visit.

If a burner will not ignite, the oven will not heat, you smell gas or electrical odor, or the panel locks out, stop use and call us. Note the exact code and whether it started after a power blink—many codes need diagnostics rather than repeated resets.

Yes. Share model and serial from the rating plate and mention dual oven, steam, or induction features so we plan the first visit with the right test path.

Clear access to the range, photograph the error display, and list which burners or oven modes still work. Leave gas shutoff reachable only if you are comfortable—otherwise we handle safe isolation on site.

Prefer to talk it through? Call Thermador Support.

844-683-0648
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