Oven timer counts down but heating does not start or stops when timer reaches zero.

Safety first: No internal access is needed for initial checks; keep mains power on.

Steps to check:

• Set to manual: Press the manual/hand symbol or cancel button until the manual indicator appears.
• Clear programs: Reset the timer to 00:00 and confirm to cancel any delayed start.
• Test manual operation: Select a cooking function and temperature without using the timer. If the oven now heats, the issue was timer programming.
• Timer contacts: If the oven still does not heat, the timer's internal contacts may be faulty and the module should be replaced.