A company installed a new HVAC system 2 weeks ago. The furnace model was new: 58TNOA110C21–20. I initially ordered 58CVA110-20 but they said it will be out of market soon in August. So they installed the new model and said it should be better. 2 days ago, I noticed a low key constant noise from the furnace in the morning around 6:20 am. The noises were loud enough to draw my attention. I went in and opened the furnace door/outer cover and tried to see where the noise comes from. It seems it is from the box where the blower is located, maybe furnace. I am not a mechanic. Then I gently tapped on the covers, the noise stopped. I thought this may be some kind of vibrations. But this morning around the same time, I heard the noise again. I took off the door and tapped the cover over the blower/furnace, the noise stopped. Does anybody have the same problem. I plan to call the installation company after the 4th holiday but just wanted to see if this maybe just a simple thing that can be resolved by myself. Any suggestions?
Called Carrier and talked to a technician. They said it could be transformer or fan motor. They need to be replaced. Will see the company tomorrow. Keep my fingers crossed.
A technician came. He found out there was a screw between new unit and the return of air duct. He took it out and screwed the two parts together at the base and taped them also. The noise has disappeared since then.