The answer to 'why is my air handler' is that there could be several common causes, such as a failed blower motor, clogged air filters, or issues with the thermostat or control board. Symptoms may include the air handler not turning on, making strange noises, or not circulating air properly.
Some potential solutions include replacing the air filter, checking the thermostat settings, and inspecting the blower motor for proper operation. However, more complex issues like a failed control board or other internal component may require the expertise of a professional HVAC technician to diagnose and repair.