Oven does not start; display shows time but no response when turning knobs (mechanical timer model)

Safety: No internal work needed for basic check.

Steps:

• Rotate the mechanical timer knob past zero and then to the manual or continuous symbol (often a hand icon).
• Try starting the oven again.
• If the oven only works when the timer is set and stops when it returns to zero, the timer is functioning but may have worn contacts; replace the mechanical timer if it fails to provide manual bypass.