Smeg oven clock and timer work, but the oven will not start heating unless the timer is set.

Safety first: No internal repair is needed for this issue.

• Set timer to manual: On electronic timers, press the manual or hand symbol button until the manual indicator appears. On mechanical timers, turn the knob to the manual or continuous-on position.
• Cancel programs: Clear any delayed start or automatic cooking programs by pressing the cancel/stop button or setting the end time to the current time.
• Test heating: Select a simple bake function and set a temperature. The oven should now heat normally.