Long time since I posted here. We were in Colorado and came home last night to a 90 degree house. The thermostat was set to 76 degrees. The unit is a Trane 4 ton XR12 (?) heatpump. The fan (variable speed dc motor) was not running. The outside unit was running but was laboring and blowing cool air. I turned the unit off and cut power. I pulled the panel off of the inside unit and the evaporator coil was a solid block of ice. I noticed that there was a green flickering light on the control board. Also, when I inspected the outdoor unit, there was ice on the compressor housing (scroll type). I've got a tech coming out from the company that did the install approx. six years ago.
My older son (21 years) was here when the fan went out on Thursday, but he did nothing. He didn't call me or shut the unit down. Grrrr!!!
Up till now, I've had no issues with this unit. Any thoughts as to what might be the issue? Is there a known issue with the DC motors for the variable speed air handler? Or could it be the contol board?