If a Whirlpool oven takes too long to preheat, removing unnecessary oven racks may correct the problem. Turning on the convection feature, if it's an available feature, may also preheat the oven up to 50 percent faster.
Whirlpool states that its wall ovens and ranges should take between 12 and 15 minutes to preheat to a temperature of 350 degrees Fahrenheit, but consumers can expect that time to be up to five minutes longer or shorter depending on the oven's interior size. Oven features, such as a hidden bake element, may also cause the preheat time to be longer than average.
There are several other factors that can impact the length of time it takes to preheat a Whirlpool oven. If the kitchen's ambient temperature is too cold or if someone opens the oven door during the preheat cycle, it can take longer for the oven to reach the desired temperature. Many buildings with elevators have electric systems at 208 volts instead of the more common 240 volts, and this difference in voltage can also lengthen the preheating time.
Consumers with Whirlpool ovens that continue to take a prolonged length of time to preheat can also contact the Whirlpool customer service department via phone or on the Whirlpool.com website to schedule a visit from a factory-authorized technician.