If the vent hood light is burned out, replace it. Some manufacturers do not sell the light bulb as an individual part; instead, they require you to purchase the light assembly.
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One or more of the halogen lamp bulbs may be burned out. Since it’s very difficult to visually determine if any of the halogen lamps have burned out, use a multimeter to test them for continuity. Alternatively, you can just try replacing the bulbs.
To determine if the light socket is defective, use a multimeter to test the incoming power to the socket. If the light socket has power, but the light bulb isn’t working, replace the light socket.
To determine if the light switch is defective, use a multimeter to test the switch for continuity. If the light switch does not have continuity, replace it.
To determine if the push button switch is defective, use a multimeter to test the switch for continuity. If the push button switch does not have continuity, replace it