Safety First: Turn off power at the breaker before removing panels or touching wiring.

Step-by-step:

Visual inspection: Remove the rear panel of the Premier range and inspect the oven sensor wiring where it passes near the oven liner. Look for melted or bare wires touching metal.
Isolate the sensor: Disconnect the sensor from the harness and test its resistance at room temperature. A reading near 0 Ω indicates a shorted sensor; replace it.
Check harness to chassis: With the sensor disconnected at both ends (sensor and EOC), check each wire to chassis ground with a meter. Any continuity indicates a short to ground; repair or replace the harness.
Control board evaluation: If the sensor and harness are not shorted but F4 remains, the EOC sensor circuit may be internally shorted. Replace the Electronic Oven Control (EOC).
Reassemble and test: Secure all wiring away from hot surfaces, reinstall panels, restore power, and test a bake cycle.

F4 displayed; oven may not heat correctly or may shut down unexpectedly.

Possible Causes