Safety first: Disconnect mains power and allow the oven to cool before working near the top element.

Steps to diagnose and fix:

Access grill element terminals: Remove the rear panel to reach the terminals of the top grill element. In some models, you may also need to remove the inner top shield.
Inspect connectors: Check for heat-damaged spade connectors or discolored insulation. Replace any burnt connectors and trim back damaged wire.
Test grill element: Disconnect one wire and measure resistance across the element. Infinite resistance indicates a failed element that must be replaced.
Replace grill element: Remove mounting screws from inside the cavity, carefully lower the element, transfer wires to the new OBH Nordica-compatible grill element, and reinstall.
Control board check: If the element tests good but does not heat when selected, the grill relay on the main control board may be defective. Replace the board if necessary.
Test: Reassemble, restore power, and run a grill/broil cycle to confirm proper operation and that F5 is cleared.

Oven displays F5 and grill or broil function is disabled.

Possible Causes