Many of the 465 models made by Whirlpool, which includes Kitchen Aid, Amana, Jenn Air, and Maytag brands, will just randomly stop heating on both broil and bake without any warning. This has a very complex system with a DSI board (direct spark ignition board) which reads the gas valves coils and checks the resistance to make sure everything is good with the valve. This board also serves other functions like sends out the actual spark to light all the burners and cuts out the gas if it doesn’t detect the flame has ignited. If the system is working properly the bake and the broil will click three times when you turn the oven on. If you only hear one or two clicks, you have a bad DSI board or a bad gas valve. There are 3 terminals on the gas valve so you need to check the resistance from the top terminal to the middle terminal, and the middle terminal to the bottom terminal. You should get a reading of approximately 215 ohms. If you don’t get a reading within 10% of that number, you need to replace the valve because even though only one coil may be bad, the DSI board will stop all oven function as soon as it detects there is a problem with one of the coils.