Oven timer counts down but heating starts late or not at the programmed time in delayed-start modes.

Safety first: No internal work is needed for basic checks.

• Review user manual: Confirm correct use of delayed start and automatic end-time functions; misprogramming is common.
• Test immediate start: Verify that the oven heats correctly in manual (non-timed) mode. If it does, the issue is likely with timer settings or timer circuit.
• Reset control: Disconnect power for several minutes to reset the electronics, then reprogram the clock and timer.
• Control board: If timer functions remain erratic, the control board may need replacement.