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F19 means that the lower oven hasn't heated at all within 5 minutes (temperature has not raised above 150ºF. This typically means that your oven igniter has failed for the lower oven. Oven igniters typically last 6-8 years before they get weak enough that they won't open the oven gas safety valve. Now if you have a multimeter you could test power between the 2 wires going to the bake igniter when the oven is set to bake. If you have 110 volts between the 1 wires and the oven won't heat, you need to replace the igniter. Below is a link to the part.
CLICK HERE for igniter
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