2 days ago, I had a contractor install a new heat pump for an addition of our house to replace a failed unit. As part of the work, I asked them to also install a whole-home bypass humidifier onto the air handler of our other heat pump that is for the main part of our house. Shortly after they left, I started to smell a burning smell through our vents in our main part of the house. The next day they came back and said that the air mount assembly went up and we needed a new one and that they were not responsible for the cost of replacing it. Apparently the motor on the air handler burned out? The heat pump on the addition is working fine, our issue is with the unit where they installed the bypass humidifier which was an Aprilaire 600 series. I heard them cutting duct work, drilling, banging, etc... as they installed the bypass humidifier.
Could something have happened to the motor when they installed the humidifier? I find the timing of motor going up as fishy. Maybe something got in the duct work during their work that caused the motor to go up? They cut the duct work to install a control unit, they also mounted the unit to the duct work on the return side. Maybe the wiring caused the motor to get fried? I have no clue.
We haven't had problems with the main heat pump unit for years. They will be replacing the air mount assembly tomorrow, is there anything I can tell by looking at it when they come to do the replacement to see if it went up because of something they did?
I am going to follow up with a call to the owner and ask them that they should repair the unit at no cost to me since it happened the sameday they did work. I will tell him that I will file a complaint with the BBB and the State Board of Licensing too if need be. I believe I shouldn't have to pay for the replacement air mount assembly. I just want confirmation that it is possible that it went up as a result of something they did while installing the bypass humidifier.