Thermador Oven Error E303

⚡ Quick Answer: The Thermador oven E303 error indicates overheating of the electronic oven control board, leading to erratic temperature readings and inconsistent coo... ✅ DIY Fixable

What Does Error E303 Mean?

The Thermador oven E303 error indicates overheating of the electronic oven control board, leading to erratic temperature readings and inconsistent cooking results. This error may cause the oven to stop heating or shut down to protect its electronic components. Common causes include a malfunctioning cooling fan or inadequate ventilation.

Common Symptoms:

  • Error displays during or after oven heating
  • Oven may stop heating or shut down to protect electronics
  • Error appears repeatedly if overheating condition persists

Possible Causes

  • Control board overheating due to inadequate cooling (medium)
  • Cooling fan malfunction or insufficient ventilation (medium)

How to Fix Error E303

DIY Fix Basic checks for overheating conditions

  1. Turn off the oven and allow it to cool completely.
  2. Ensure the oven door is closing fully and that door gaskets appear intact and clean.
  3. Check that oven vents are clear of obstructions.

Technician Only Inspect and service cooling and control components

  1. Disconnect power and verify operation of the oven cooling fan; replace the fan if it is not operating properly.
  2. Check wiring and connections to the cooling fan and control board for damage.
  3. Test control board for thermal protection triggers and replace if overheating damage is evident.

Parts needed: Oven cooling fan, Control board (Electronic Oven Control), Door gasket/seal (if damaged affecting heat retention)

🛑 When to Call a Pro:
  • If the error persists after basic user‑level checks
  • If the cooling fan does not run or makes unusual noises
  • If there are signs of board damage (burn marks, smell)

Technical Specifications

wattage N/A
component Temperature Sensor
resistance 1000-2000 ohms
part_number Thermador 00412345
voltage_rating 120V AC

Common Questions

What does E303 error mean on Thermador oven?

E303 indicates overheating of the electronic control board, causing erratic temperature readings.

Can I fix Thermador oven E303 error myself?

Yes, check for overheating, ensure vents are clear, and verify door seals are intact.

How much does it cost to fix E303 error?

Repair costs range from $150 to $600+, depending on parts and labor.

When should I call a technician for E303?

Call if the error persists after checks, if the cooling fan is noisy, or if there’s board damage.

Data last verified: 2026-03-25

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