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It sounds like before may have just been a coincidence by toggling the manual timer switch. You could have a bad switch, but more likely is that your oven igniter is just getting weak and needs to be replaced. You'd need a multimeter to test power going down to the igniter on your bake burner but if you have 110 volts between the 2 wires going to the bake burner and the oven gas valve isn't opening to turn the oven on, your igniter just needs to be replaced. These igniters are designed to last about 6-8 years before they get weak and can't open the oven gas valve anymore for safety reasons so that is the most likely cause.
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