Arrived on site, homeowner stated there was a strong chemical smell (last night) before the unit stopped keeping up with the set point. I started by turning on the fan and immediately noticed that it had not come on. I then checked the refrigerant lines and found them to be frozen around the evaporator coil as well as the condenser. I smelled burning around the blower motor housing. Called American standard tech support to verify the circuit board was still working properly. Trane rep was able to verify that circuit board was still working properly and that only the motor was damaged. I replaced the motor under parts and labor warranty and tested extensively as this is the second motor to burn out. Examined every wiring connection on entire system and found corrosion on neutral wire coming into the furnace. No signs of water damage in the furnace compartment. Tested motor in various functions and performance was good. Proceeded on to dryer vent cleaning and heating maintenance.
