The answer to 'why is my air handler not working' is that there could be several common causes, such as a tripped circuit breaker, a clogged air filter, or a problem with the motor or fan. Symptoms may include the air handler not turning on at all, blowing warm air instead of cool air, or making unusual noises.
If the air handler is not working, the first thing to check is the circuit breaker. If the breaker has tripped, simply reset it. If it trips again, there may be an electrical issue that needs to be addressed by a professional HVAC technician. Another common problem is a clogged air filter, which can restrict airflow and cause the air handler to malfunction. Replacing the air filter is a simple DIY task that can often resolve the issue. However, if the problem persists or you suspect a more complex problem with the motor, fan, or other components, it's best to call in a professional HVAC technician to diagnose and repair the issue.