The answer to 'why is my smoke detector circuit overload' is that the smoke detector circuit is drawing too much electrical current, causing an overload. This can happen due to a variety of reasons, such as a short circuit, a faulty smoke detector, or a problem with the wiring. Symptoms of a smoke detector circuit overload include the smoke detector not working, flickering lights, or tripped circuit breakers.
To fix a smoke detector circuit overload, you'll first want to identify the root cause. This may involve checking the smoke detector itself, inspecting the wiring, and testing the circuit breaker. If the issue is with the smoke detector or wiring, you may be able to resolve it yourself. However, if the problem is with the electrical panel or requires more extensive repairs, it's best to call a licensed electrician to diagnose and fix the issue.