Oven heats but never reaches the set temperature or takes excessively long to preheat.

Safety First: Turn off power before testing electrical components.

• Check preheat time: A typical Thor Kitchen electric oven should reach 350°F in about 10–15 minutes. Significantly longer times indicate a heating issue.
• Inspect elements: Confirm both bake and broil elements glow red during preheat. If one does not, test and replace it.
• Test temperature sensor: Remove and test the oven temperature sensor for correct resistance (~1080–1100 Ω at room temperature). Replace if out of range.
• Door gasket: Inspect the oven door gasket for gaps, tears, or compression. Replace if it does not seal evenly around the door.
• Calibrate control: Many Thor Kitchen ovens allow temperature calibration in the settings menu (e.g., ±35°F). Use an oven thermometer to compare actual vs. set temperature and adjust calibration if needed.