Now one switch makes fan/light AND heat lamp come on together. Therefore attention should be given to the circuit which provides power to these devices to make sure there is not an overloaded condition. I replaced the switch (3-wire)120V wit the same style that I removed. Don’t cinch it down tight, but tighten it enough … Come browse today! I’m having a problem when l use my top bathroom and hallway light. The GFI in the garage normally does not feed power into the bathrooms, but still I am glad you have found the solution. cheeky-chi. This electrical wiring project is best performed by a Licensed Electrical Contractor or Certified Electrician. Is this something that I can do myself like replacing LED light parts or will I need to employ an electrician? The light that is part of the exhaust fan is not working. Job done. Hi my bathroom has four heat lamps with an exhaust fan and a light in the middle. 2 - Check the bathroom outlets. I am just telling you what i know, can you please help!