What E3 Means
E3 means the oven temperature sensor (RTD) circuit for the convection side is open — the control board has lost its reading entirely.
Common Causes of E3
- Failed temperature sensor
- Disconnected or broken sensor wiring
- Corroded connector
🔧 One Safe Check You Can Try
There isn't a safe at-home test for this — it requires multimeter testing on a de-energized unit, which is technician work.
⚠ Why You Shouldn't Go Further Than That
- This circuit sits close to the unit's microwave high-voltage components, which carry serious shock risk even when the unit appears off.
- A sensor reattached even slightly out of position reads inaccurately even when the part itself is fine.
- This fault is easy to confuse with a heating element issue on the convection side, risking replacement of the wrong part.
- Built-in speed ovens require careful partial removal from cabinetry, risking trim damage if rushed.
- Cavity access for this repair typically voids the remaining warranty.