Oven does not heat at all on any setting, but the display and light work normally.

Safety first: Isolate the oven from mains power before testing or replacing any components.

• Check elements: Inspect top, bottom, and convection elements for visible breaks. Test each element's resistance from the rear terminals; an open circuit indicates failure.
• Test thermal fuse: Locate the thermal fuse on the oven body and test for continuity. Replace if open with the correct Tristar thermal fuse.
• Verify power to elements: With extreme caution and only if qualified, check if mains voltage reaches the elements when a heating function is selected. If not, the main control PCB or selector switch (on manual models) may be faulty.
• Replace faulty part: Replace the failed heating element, thermal fuse, or main control PCB as identified.

Reassemble and test a low-temperature bake cycle to confirm heating is restored.