The part(s) or condition(s) listed below for the symptom Bath fan light and fan not working are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
If the bath fan plugs into an outlet, plug an electronic device into the outlet to see if the outlet has power. If the bath fan does not plug into an outlet, check the home circuit breakers or fuses.
To determine if a switch is defective, use a multimeter to test the appropriate switch for continuity. There may be up to three different circuits controlling the fan, light, and heater separately. If the switch does not have continuity in the on position, replace it.