Maybe someone can shed a little light on this...
I've got an 8 year old York heatpump which takes care of the main floor of our house. Lately, the coils in the blower unit (in the basement) have been freezing up. It doesn't take long either. I returned from a weekend away (had the unit turned off all weekend) and within 2 hours of turn on, no airflow. Checked the blower unit...frozen. Any ideas on this one???