What E4 Means
E4 means the oven temperature sensor (RTD) circuit for the convection side is shorted, sending the control board an invalid signal.
Common Causes of E4
- Failed temperature sensor sending a shorted signal
- Moisture intrusion into the sensor connector
- Damaged wiring insulation
🔧 One Safe Check You Can Try
There isn't a safe at-home test for this — sensor circuit testing requires a multimeter on a de-energized unit, which is technician work.
⚠ Why You Shouldn't Go Further Than That
- This circuit sits close to microwave high-voltage components; testing it live carries serious shock risk.
- The sensor is located inside a compact built-in cavity where careless removal risks damaging trim and insulation.
- This fault can be mistaken for a convection heating-element issue, leading to an unnecessary, more expensive part replacement.
- A sensor reinstalled even slightly out of position continues to read inaccurately after the "fix."
- Built-in cabinetry access for this repair is a common way this warranty gets voided.