Those are not exceptions. Those actions are not for the purpose of those melachos, and those aren’t the exclusive purposes of the devices. The purpose of the KosherSwitch is expressly to turn the light on and off, and that is your express intention when you flip it.
The purpose of an oven door is to keep the heat in and to access the food. The purpose of the button in the water cooler is to get water. Occasionally, the door will activate the fire, and the button will activate the compressor, but it’s not your kavanah, not a psik reisha, and not the purpose of the door and button.