Properly-functioning circulation in an AC installation is essential not only for overall comfort, but for the welfare of the system. Obviously, if the fan fails, there’s no cooling. Dirt can affect efficiency (and a healthy environment), and an improperly adjusted blower can cause iced-up coils. Air handlers have safety mechanisms that must be intact.
Evaluate circulator fans for operation. They should come on when cooling is initiated, and turn off afterwards. Fans should not be noisy or vibrate. Inspect as possible for dirt buildup. Air handlers should have a safety switch that shuts off the circulator when the fan compartment cover is removed. If you are inspecting an evaporative cooler, ensure that the pump is operative with no leaking or excess noise or vibration.
The circulator fan door interlock switch is missing or defective. This is a potential safety concern that may also prevent the system from running at all. Hire an HVAC contractor to repair or replace the switch.
The circulator fan is dirty. This reduces the efficiency of the blower, and affects indoor air quality. Hire an HVAC technician to clean and service the system.
The air handler’s interior insulation is loose. This can damage the circulator fan if it falls into the blower assembly. Hire an HVAC technician to provide repairs as needed.
The air handler for the HVAC system is installed in a restricted space that may prevent proper access by service personnel. Hire a contractor to make repairs as needed.
