Noisy Indoor Unit, Loud Furnace:
Noisy indoor unit, air handler, and furnace complaints usually fall into one of six different categories:
Another and more likely cause is that the blower wheel actually broke, in which case it would need to be replaced. This makes a very disturbing sound almost as bad as fingernails on a chalk board.
A third possibility is that a motor mount broke, causing the entire motor and blower assembly to drop and the blower wheel is hitting the housing. In any case, please shut off the system ASAP when this sound is heard or the repair bill could significantly increase.
Very Important: If you hear an unusual rumbling sound associated with combustion from your gas or oil-fired appliance, call for service immediately. This indicates what could be a serious problem with the burner portion of your appliance. Turn off equipment if necessary.
So to sum it all up, below is a list of possible causes. Items in red usually require a service call. Items in blue however can be addressed, some even fixed by the homeowner.
Red = Professional fix | Blue = Homeowner fix
- Loose blower wheel
- Broken blower wheel
- Out of balance blower wheel
- Broken motor mount
- Bad motor bearings
- Noisy transformer
- Noisy refrigerant check valve
- Sheet metal duct-popping
- Faulty combustion
The bottom causes in blue (if any), are commonly found problems and can be addressed by the homeowner. Try to check for these conditions first before calling for service.
Please keep in mind that the information found on our website is provided free of charge and Hannabery HVAC does not assume any liability resulting from the information we provide. We hope this information helps, but please note that these are just rough guidelines, and not all possible situations are covered. Your HVAC system should be inspected and repaired by a trained technician.