Oven heats but takes a very long time to reach temperature, or never reaches set temperature

Safety: Isolate power before testing elements or seals.

• Check which elements heat: In fan mode, observe if the rear element glows (if visible). In conventional mode, check both top and bottom heat. A non-glowing element may be failed.
• Test elements: Use a multimeter to measure resistance of each element individually from the rear of the cooker. Replace any open or significantly high-resistance elements.
• Inspect door seal: Check the rubber gasket around the door for gaps, tears, or compression. Replace if damaged or not sealing properly.
• Verify temperature: Use an oven thermometer to confirm actual temperature. If elements and seal are good but temperature is low, suspect the thermostat or sensor and replace as needed.