Furnace fan motors can and do breakdown. They make different noises so I will list those noises here and let you know what is happening with your furnace.
This normally indicates something is wrong with the blower wheel. It is off balance either from throwing a balancing weight or breaking welds and crimps. If the blower wheel contains a piece of paper, duct tape or debris buildup this can throw the wheel out of balance and this out of balance is what is causing the noise.
The fan making too much noise is caused by a number of things:
All these things can be fixed in a number of ways. Give us a call and we’ll come to you and let you know exactly what it is going to take to give you some peace and quiet when your furnace turns on.
This is from too much air going through too small a space. Are all the registers open? The blower speed could be set too high. The ducting could be too small for the amount of airflow.
This is normally from a defective register or a dampener just inside the ducting. Most register rattle can be handled by taking the register off the wall and crimping the offending piece or, if it is from a dampener, fixing the dampener in a single position.