The part(s) or condition(s) listed below for the symptom Air handler is noisy or loud are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
The blower wheel blows air out of the furnace or air handler and through the house. The blower wheel is attached to the blower motor shaft with a set screw. If the set screw is loose, the blower wheel will wobble on the motor shaft, and the wheel will be noisy as it turns. Check the set screw to ensure that it is properly tightened. Next, inspect the wheel for damage. If the blower wheel is damaged, replace it.
Over time, the blower wheel can become clogged with dust and debris or the set screw securing the blower wheel to the motor shaft can loosen. This can cause the blower to become unbalanced and vibrate or rub against the housing. You can try tightening or replacing the set screw to fix the problem. You can also try cleaning the blower wheel with compressed air or with a soft bristle brush. Use caution when trying to clean the blower wheel as the fins are sharp and can be easily damaged. If the blower wheel and housing is damaged, the assembly will need to be replaced.
Over time, the bearings in the fan motor wear out, causing the motor to become noisy. Some furnace or air handler fan motors can be lubricated, so if applicable, try lubricating the motor first. If lubricating the motor doesn’t solve the problem, or if the fan motor can’t be lubricated, replace the motor.
Over time, the bearings in the blower motor wear out, causing the motor to become noisy. Some furnace or air handler blower motors can be lubricated, so if applicable, try lubricating the motor first. If lubricating the motor doesn’t solve the problem, or if the blower motor can’t be lubricated, replace the motor.
Over time, the bearings in the motor wear out, causing the motor to become noisy. Some furnace or air handler motors can be lubricated, so if applicable, try lubricating the motor first. If lubricating the motor doesn’t solve the problem, or if the motor can’t be lubricated, replace the motor.
A clogged air filter can cause strange whistling or low humming noises. The air filter is a critical part of heating and cooling the home. Not only does it filter the circulated air, it also helps keep the air ducts and air conditioner coil from clogging up. It is recommended to replace the air filter at least every 6 months, or sooner depending on the conditions.
