SOURCE: F4 code when preheating oven
That code means "Shorted Oven Sensor". You can find out more about this by removing the bottom drawer, pull it out til it stops, lift it up and pull it all the way out. Now lay down on the floor and look under the oven to the left side. You will see a service info card there. Pull it out, open it up and have a read.
SOURCE: Preheat takes forever
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Oven temp sensors sense the temperature is the oven cavity and the temp sensor changes resistance, this change in ohm resistance tells the oven control what temperature the oven cavity at and tells the control to shut off the element or turn it back on. The most common temp sensors used today ( *not all ) are approx 1000-1100 ohm resistance at room temperature ( 70�F )
Some ohm readings and there temperature:
Degrees F - Resistance
100 - 1143 ohms
200 - 1350 ohms
300 - 1553 ohms
350 - 1654 ohms
400 - 1753 ohms
500 - 1949 ohms
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http://www.applianceaid.com/elecrange.html
SOURCE: Oven appears to start, takes forever to preheat,
This is what I would do: I would unplug the range and connect my test cord to your range cord. I use an ammeter along with my test cord to read the amp draw of the bake ignitor. If it cannot get above 3.5 amps I know the ignitor is bad or weak. Since the oven is working that means there is a good circuit. In order for the safety bi-metal to open the amp draw must reach 3.5 amps or better. So to me I am thinking bad ignitor. To get to it I remove the door oven racks and bottom, I then remove the flame spreader and unplug the quick connect to the ignitor. I remove the burner and ignitor and replace the ignitor on a work bench. I am too old to be bending over and trying to do any parts replacement inside an oven. LOL. I have a training film which shows how the silicone carbide ignitor works HERE. Post a model number and I may have a service manual, do not forget to rate the answer.
If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61
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