Large appliances and HVAC units can cause lights to flicker when they power on, because they are drawing a large current from the circuit. Occasionally one set flickers more than the other. This could … Why do they flicker? Electrical Troubleshooting for Flickering Lights and Dim Light Problems The following are examples of common causes of dim or flickering lights that will be identified as you consider the following questions about the condition and occurrences. should i replace the circuit breaker? I thought the dimmer switch was going bad but I just noticed the hall lights were flickering even when the bathroom light was out. There are other possibilities of course, such as a damaged wire in the wall or outlet box, but it's difficult to cover every possibility and explain hot to troubleshoot for it. If only all the light bulbs controlled by a dimmer switch blink, that switch is likely bad. All you need to do is an easy test. However, if all the lights flickering are on one circuit, it's easier to isolate the problem than if random lights throughout the house are flickering. When they change out all of their LED Lamps and/or lighting fixtures and then turn them on, they often find them flickering. But sometimes they can indicate a more serious underlying issue. Flickering Lights - Common Electrical Circuit Problems: Verify that light bulbs are tight and making contact in the socket. the circiurt breaker for this circuit never trips. See The weak points of your system. Loose connections are a fire hazard, so call an electrician ASAP to come evaluate your electrical system. I have replaced all the outlets on the circuit to no avail. The bathroom light has been flickering for some time. In one of the rooms, I have two sets of lights on two different switches, on a single circuit. The flicker sometimes stops if I replace one of the lights on the switch with an incandescent bulb. unexplainedly it will come back on maye an hour later to flicker for a hour or two then go out again. Knowing the extent of what is affected helps identify the likely locations of the loose connection. Constant or severe drops in lighting can result from circuit overloads or faulty connections somewhere along the circuit. If there is more than one light bulb in the fixture and only one is flickering the problem is most likely a defective light bulb or socket. Flickering lights are normally not a cause for alarm. If there is more than one light bulb in the fixture and only one is flickering the problem is most likely a defective light bulb or socket. Any heavy load on that circuit, or depending upon your electric service size and demand, a heavy load anywhere in the house should cause "dimming" on lighting circuits, but "flickering" is a different animal, it's caused by loose connections. Probable Cause: If flickering lights are not contained to one area of your home and are not associated with a large home appliance switching on, it may be a sign that there’s a larger problem with your electrical service, such as loose service conductors in your central electrical panel. Your lights wouldn't really flicker unless the voltage was dropping to less than 100 volts. on one circuit in home, lights flicker then power goes out. Loose electrical connections in an electrical circuit: loose splices or connections anywhere in an electrical circuit can cause flickering lights.