Oven fails to heat in conventional or fan modes; F04 appears, often linked to lower or circular element failure.

Safety first: Turn off the power at the mains. Confirm the oven is cold before touching any elements.

Step-by-step checks:

• 1. Identify which mode fails: Test conventional bake, fan bake, and bottom heat (if available). Note which functions do not heat; this points to the specific element (lower base element or circular fan element).
• 2. Inspect elements: Remove the oven shelves and back panel inside the cavity (for fan element) or bottom panel (for lower element). Look for cracks, bulges, or burn marks.
• 3. Test continuity: From the rear of the oven, disconnect the suspect element's wires. Measure resistance across the terminals. A good element typically reads 20–60 Ω. Infinite resistance indicates a failed element.
• 4. Check wiring and connectors: Inspect the wiring harness from the element to the control board. Replace any burnt spade connectors and ensure tight connections.
• 5. Replace the faulty element: Unscrew the mounting screws inside the cavity, gently pull the element forward, transfer wires, and fit a genuine Hotpoint-Ariston lower heating element or circular fan element as required.
• 6. Test operation: Reassemble panels, restore power, and run a heating cycle to confirm the F04 code has cleared.