Display shows F4; oven may not start or may shut off; intermittent temperature issues.

Safety first: Turn off power at the breaker and allow the appliance to cool.

• Inspect sensor and wiring: Access the rear of the range and locate the sensor harness. Look for areas where the wire may have contacted hot metal or sharp edges, causing a short. Repair or replace damaged wiring.
• Measure sensor resistance: Disconnect the sensor and measure resistance at room temperature. A very low resistance (near 0 Ω) indicates a shorted sensor. Replace the sensor if readings are out of spec.
• Check for chassis shorts: With the sensor disconnected, check each sensor lead to chassis ground with a multimeter. Any continuity indicates a short in the harness that must be corrected.
• Replace EOC if needed: If sensor and harness are good but F4 persists, replace the EOC.
• Final test: After reassembly, restore power and run a bake cycle to verify stable temperature and absence of error codes.