When a residential oven refuses to adjust below 170 degrees Fahrenheit, it is usually because 170 degrees is the factory-programmed minimum temperature threshold designed specifically for the "Warm" or "Keep Warm" setting on your electronic control board. Standard baking modes are restricted from operating below this temperature to prevent bacterial growth in food left in a lukewarm cavity. You can troubleshoot control settings easily by reviewing your user manual. You can verify that your appliance is operating normally when checking programmed operational limits confirms that 170 degrees is the lowest allowable setting for food safety on your specific stove model.
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