Oven fails to reach set temperature, may stop heating early or show error after a short heat period

Safety: Isolate the oven from mains before removing panels or the sensor.

• Check sensor resistance vs temperature: Remove the sensor as described for F03. Measure resistance at room temperature and again after gently warming the tip in warm water (sealed in a bag). The resistance should change smoothly.
• Inspect connectors: Clean any oxidised sensor pins or PCB header with contact cleaner. Ensure a tight fit when reconnecting.
• Check harness continuity: With the sensor unplugged at both ends, test each wire from sensor plug to PCB plug for continuity and for shorts between wires.
• Replace sensor if readings are off: If the resistance is significantly outside the expected range or jumps erratically, replace the sensor with the correct Hotpoint part.
• Control board check: If a known-good sensor still gives F04, the main PCB may have a faulty input circuit or corrupted calibration and will need replacement.