Next to the buzzing sounds, another common problem of dimmer switches is flickering lights. The flickering light is very problematic; some may feel sick or even get headaches. Whether it is LED, CFL, or Incandescent bulbs all are flickers prone. You can check the following steps to solve this. Rapid On And Off The principle of dimmer switches is rapid on and off to reduce the brightness level. Old light bulbs may fail to withstand such high frequency and result in flickering. So, replace the bulb to sort out the problem. Loose Connection A loose wire connection is another cause of flickering. electric signals may lose sometimes due to loose connection and results inconsistent lighting. To fix this remove dusts and unwanted things from the circuit and connect the wire properly. Loose bulbs Likewise loose wire connection, the loose bulb may cause flickering. So, switch off the bulb and set the bulb in the base properly.