Error Detected May 1, 2026
Error Code

Bertazzoni Wall Ovens Error Code Er03

Er03 indicates a temperature sensor malfunction or communication failure between the oven's control board and the temperature monitoring system. This error prevents the oven from accurately reading internal temperature and may disable heating functions as a safety precaution.

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Quick Diagnostics
Signs 7 identified
Possible Causes 8 listed
Safety Checks 8 steps
If unsure, stop using the appliance and contact a certified technician immediately.
What you notice

Signs

7
  • 01
    • Oven fails to heat or reaches incorrect temperatures
  • 02
    • Display shows Er03 code persistently or intermittently
  • 03
    • Oven beeps repeatedly when attempting to preheat
  • 04
    • Heating elements do not activate when oven is turned on
  • 05
    • Temperature display fluctuates erratically or shows zero
  • 06
    • Oven shuts off automatically during cooking cycles
  • 07
    • Control panel becomes unresponsive after Er03 appears
Why it happens

Possible Causes

8
A
• Temperature sensor probe (RTD or thermistor) has failed or become disconnected
B
• Loose or corroded wiring connections between sensor and control board
C
• Control board malfunction preventing proper sensor signal reading
D
• 120V/240V power supply fluctuations causing sensor communication errors
E
• Moisture or condensation damage to sensor connectors from oven steam
F
• Damaged sensor probe from physical impact or manufacturing defect
G
• Faulty control panel unable to process temperature data
H
• Thermal fuse has blown due to internal electrical fault
DIY — No disassembly

Safety Checks You Can Do

8
  1. 1
    • Turn off power to the oven at your home's circuit breaker panel and wait 60 seconds, then restore power to reset the appliance control board
  2. 2
    • Verify the correct circuit breaker is supplying power to the wall oven and confirm it has not tripped
  3. 3
    • Allow the oven to cool completely for at least 30 minutes if it was recently used before attempting to operate again
  4. 4
    • Inspect the oven interior for any visible moisture, water droplets, or excessive steam buildup and allow to dry naturally
  5. 5
    • Check that oven racks are properly seated in their designated slots and not blocking any interior vents or sensors
  6. 6
    • Review your oven's control panel settings to ensure no child lock or special diagnostic mode has been activated
  7. 7
    • Verify that no food debris, grease splatter, or foreign objects are near the temperature sensor area inside the oven cavity
  8. 8
    • Attempt a test bake at a low temperature setting (around 250°F) to determine if the error recurs
Always unplug the appliance before performing any physical check. These are visual/external checks only.
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