The answer to 'dimmer switch circuit overload' is that a dimmer switch can become overloaded when the connected lighting load exceeds the switch's capacity. This can happen if too many lights or high-wattage bulbs are connected to the same dimmer. Symptoms may include flickering, buzzing, or the dimmer switch failing to function properly.
The solution is to ensure the total wattage of the connected lights does not exceed the dimmer's rating, typically 600 watts or less. If the circuit is overloaded, you may need to replace the dimmer switch with one rated for a higher wattage capacity, or reduce the number of lights on the circuit. If you're unsure, it's best to consult a licensed electrician to diagnose and resolve the issue safely.